Guard fence post structure

Abstract

To provide support structure of a guard fence installed with support bodies on a sill serving as foundation, capable of absorbing impact energy, even when an impact force is applied to any part of the support bodies.SOLUTION: The support structure of a guard fence 10 is provided which is installed on the ground with a prescribed interval for extending a protective net 12. The structure has a sill 30 constructed on the ground and support bodies 22 installed on the sill 30, and base plates 40 are placed on the sill 30 and erected with the support bodies 22 thereon. The base plates 40 are fixedly installed on the sill 30 with a fixing force allowing movement of the base plates to a valley side on the sill 30 by receiving a load equal to or more than a prescribed value toward the valley side of a ground slope.SELECTED DRAWING: Figure 1

Description

[Technical field]

[0001] The present invention relates to a support structure used in a protective fence that prevents disasters by catching collapsing soil, falling rocks, etc. [Background technology]

[0002] Traditionally, protective fences have been installed on mountain slopes to protect adjacent roads, railways, and homes from natural disasters such as falling rocks, landslides, and avalanches. In particular, in earthquake-prone Japan, where earthquakes are likely to cause falling rocks and landslides on slopes, it is extremely important to install protective fences and take measures against disasters.

[0003] Such protective fences generally include a number of posts erected on a structure or a slope and a net stretched between the posts.

[0004] For example, the protective fence described in Patent Document 1 is formed by stretching a net between multiple posts erected on a ground slope, and each post is made of a highly rigid columnar body, and is erected by embedding the base of the columnar body into the ground. When an impact force acts on the protective fence due to falling rocks, etc., the impact energy is absorbed by the stretching of the net without deforming the posts.

[0005] In the protective fence described in Patent Document 1, the impact force not absorbed by the net is transmitted to the posts, and the posts are subjected to a resistance from the surrounding ground that resists this impact force, so a large load acts on the posts. In order to be able to withstand a large load without deforming, the base of each post needs to be buried deep into the ground and firmly fixed to a concrete foundation, which creates problems in terms of construction time and cost. Furthermore, if the support pillar is damaged due to being unable to withstand the impact force, it is necessary to destroy the concrete foundation, pull out the buried support pillar, and replace the entire support pillar, which poses the problem of increased construction time and cost involved in maintenance work on the support pillar.

[0006] To solve this problem, Patent Document 2 discloses a guardrail support structure in which a pillar-shaped support body is erected via a hinge on a foundation built on a ground slope, rather than embedding the support. The support body is prevented from tilting toward the valley by a bracing rope stretched from the top end of the support body toward the mountain slope, and is also prevented from tilting toward the slope by a highly rigid rod-shaped body extending from the support body toward the mountain side. The bracing rope is equipped with a shock absorber capable of absorbing impact forces.

[0007] In the support structure described in Patent Document 2, the support body is not buried in the ground, so that the installation and replacement of the support body is easy, and the time and cost required for maintenance work when the support body is damaged can be significantly reduced. In addition, in a protective fence equipped with this support structure, when an impact force is applied by a rockfall or the like, the net is stretched to absorb the impact energy, and the support rope supporting the support body is stretched by tilting the support body via the hinge, and the impact energy can be absorbed by the buffer attached to the support rope. In this way, by tilting the support body itself, the load acting on the support can be reduced and damage to the support can be suppressed. [Prior art documents] [Patent documents]

[0008] [Patent Document 1] JP 2012-117361 A [Patent Document 2] JP 2003-105721 A Summary of the Invention [Problem to be solved by the invention]

[0009] However, in the pillar structure described in Patent Document 2, when an impact load acts above the pillar body, the pillar body can be tilted significantly to effectively absorb the impact energy, but when a falling rock collides with the lower end of the pillar body where the hinge is attached, a force is applied to the fulcrum of the pillar body, so that the pillar body cannot be tilted to absorb the impact energy.

[0010] The present invention has been made in consideration of the above-mentioned problems, and aims to provide a support structure for a protective fence in which the support body is installed on a foundation, which is capable of absorbing impact energy regardless of where on the support body an impact force acts. [Means for solving the problem]

[0011] In order to achieve the above object, the post structure of a protective fence described in claim 1 is a post structure of a protective fence that is installed on the ground at a predetermined interval in order to stretch a protective net, the post structure comprising a base constructed on the ground and a post body installed on the base, On the above foundation Directly or indirectly a substrate on which the support body is placed and on an upper surface of the substrate; a guide mechanism that guides the movement of the base plate and the support body on the base from the mountain side to the valley side of the ground slope; a destructible member that is provided on the base and that is destroyed by a load from the base when the base plate and the support body move; Equipped with The guide mechanism includes: a slot provided in the substrate and extending from the peak side to the valley side; an anchor bolt that is fixed to the base, has a tip portion protruding from an upper surface of the base, and passes through the long hole while being positioned at an end portion of the long hole on the valley side; The substrate is By screwing nuts onto the anchor bolts, the guardrail captures falling rocks. A load of a predetermined value or more is applied to the base plate toward the valley side. In this case, substrate and the support body but Guided by the guide mechanism The device is characterized in that it is fixed to the base with a fixing force that may cause it to move toward the valley. In order to achieve the above object, the post structure of a protective fence described in claim 2 is a post structure of a protective fence that is installed on the ground at a predetermined interval in order to stretch a protective net, the post structure comprising a base constructed on the ground and a post body installed on the base, A substrate that is directly or indirectly placed on the base and has the support body erected on an upper surface thereof; a guide mechanism that guides the movement of the base plate and the support body on the base from the mountain side to the valley side of the ground slope; a rope having one end attached to the base plate and movable toward the valley side together with the base plate, and two plate-like members fixed to the base and sandwiching the rope on the mountain side of the base plate; and a brake means for generating a frictional force between the rope and the two plate-like members when the base plate moves; The guide mechanism includes: a slot provided in the substrate and extending from the peak side to the valley side; an anchor bolt that is fixed to the base, has a tip portion protruding from an upper surface of the base, and passes through the long hole while being positioned at an end portion of the long hole on the valley side; The base plate is fixed to the foundation with a fixing force sufficient to enable the base plate and the pillar body to move toward the valley side, guided by the guide mechanism, when the protective fence captures a falling rock and a load of a predetermined value or more is applied to the base plate toward the valley side by screwing a nut onto the anchor bolt.

[0012] According to this configuration, since the support body is erected on the upper surface of the base plate, when a collision load acts on the support body due to a rockfall or the like, the collision load acts on the base plate toward the ground slope valley side via the support body. The base plate is not fixed firmly to the base, but is fixed to such an extent that when the collision load acting on the base plate reaches a predetermined value or more, the base plate can move on the base toward the ground slope valley side upon receiving the impact load. Therefore, the impact energy can be absorbed by the movement of the support body and the base plate. In this way, by making the entire support body movable relative to the base, even if an impact load acts on any part of the support body in the vertical direction, the support body can be displaced relative to the base to reduce the impact and absorb the impact energy.

[0014] According to this configuration, when the collision load acting on the base plate reaches or exceeds a predetermined value, the base plate receives the impact load and moves on the base along the long hole formed in the base plate toward the valley side of the ground slope. As a result, even if the impact load acts on any part of the support body in the vertical direction, the support body can be displaced relative to the base plate to absorb the impact energy. In addition, the length of the long hole can regulate the movable distance of the base plate. Furthermore, since the anchor bolt is installed in the base plate and the anchor bolt is inserted into the long hole formed in the base plate, construction is easy.

[0019] In addition, claims 3 The support structure according to claim 1 or 2 In the support structure described in The substrate and before memorabilia Table and and disposed between the substrate and the soil. Table and The friction control plate controls the frictional resistance between the

[0020] According to this configuration, the substrate and the soil Table andThe friction control plate placed between the substrate and the soil On the table It is possible to control the frictional resistance when moving relative to the object.

[0021] In addition, claims 4 The support structure according to claim 1 to 3 In the support structure according to any one of the above, The base is characterized by comprising a concrete foundation provided on a ground slope, and a metal reinforcing plate placed on the concrete foundation on which the substrate is placed.

[0022] According to this configuration, By forming the base from a solid concrete foundation, the base can be stabilized, and the surface of the base can be reinforced with a reinforcing plate, thereby preventing the surface of the concrete base from collapsing due to the frictional force of the substrate when the substrate moves over the base.

[0023] In addition, claims 5 The support structure according to claim 4 In the support structure described in The reinforcing plate is characterized in that one end is attached to the substrate and the other end is attached to a frame portion protruding upward from the outer peripheral edge of the reinforcing plate, and the reinforcing plate is provided with a biasing means that expands or contracts when the substrate moves toward the valley side, thereby biasing the substrate toward the mountain side.

[0024] According to this configuration, When the substrate moves, the biasing means attached to the substrate expands and contracts, so that the substrate's movement energy, i.e., the impact energy received by the support column body, can be absorbed by the biasing means. In addition, the expansion and contraction force of the biasing means makes it easier to control the sliding load when the substrate moves, and maintenance after the substrate has moved is also easy.

[0025] In addition, claims 6 The support structure according to claim 1 to 5 In the support structure according to any one of the above, The support body is tiltably mounted on the base plate via a hinge.

[0026] According to this configuration, when an impact force acts on the support body, in addition to the movement of the support body relative to the base, the support body is tilted via the hinge, so that a larger impact energy can be absorbed. Also, the hinge can eliminate the moment acting on the board, which makes it easier to control the load acting on the board in the direction of movement. Effect of the Invention

[0027] According to the protective fence post structure of the present invention, the base plate on which the post body is erected is configured to be able to move on the base along the long hole, so that when an impact load acts on the post body due to falling rocks or the like, the entire post body can be moved relative to the base to absorb the impact energy, regardless of whether the impact load acts on the top or bottom of the post body. [Brief description of the drawings]

[0028] [Figure 1] 1 is a perspective view of a protective fence equipped with a support structure according to the present invention; [Diagram 2] FIG. [Diagram 3] FIG. 4 is a cross-sectional view showing a main part of the support structure. [Figure 4] FIG. 2 is a plan view of the support columns seen from above, illustrating a state before the substrate is moved. [Diagram 5] FIG. 13 is a plan view of the support columns seen from above, illustrating the state after the substrate has been moved. [Figure 6] 5 is a cross-sectional view similar to FIG. 2, showing a main part of a support structure according to a second embodiment. [Figure 7] FIG. 11 is a plan view of the support column of the second embodiment, seen from above. [Figure 8] FIG. [Figure 9] 11 is a perspective view of a protective fence equipped with a support structure of a third embodiment. FIG. [Figure 10] 10 is a cross-sectional view similar to FIG. 2, showing a main part of a support structure according to a third embodiment. [Figure 11] FIG. 11 is a plan view of a support column according to a third embodiment, seen from above. [Figure 12] FIG. 11 is a side view of the protective fence of the third embodiment, illustrating the operation of the protective fence. [Figure 13] FIG. 13 is a cross-sectional view showing a main part of a support structure according to a fourth embodiment. [Figure 14] FIG. 13 is a plan view of a support column according to a fourth embodiment, seen from above. [Figure 15] FIG. 13 is a cross-sectional view showing a main part of a support structure according to a fifth embodiment. [Figure 16] FIG. 16 is a cross-sectional view taken along line AA in FIG. [Figure 17] FIG. 13 is a plan view of the support pillar from above, showing a modified support pillar structure having a destructible member. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0029] (First embodiment) FIG. 1 is a perspective view of a protective fence 10 equipped with a support structure 1 according to a first embodiment of the present invention. Each drawing is a schematic diagram and does not strictly show the dimensions of each component. The protective fence 10 is equipped with a plurality of support posts 20 and a protective net 12 (hereinafter also simply referred to as "net 12") stretched between the support posts 20, and prevents damage by trapping falling rocks, collapsed earth and sand with the net 12. The height of the support posts 20 above ground is, for example, about 2m to 5m, and the interval between the support posts 20 is, for example, 3m to 5m, or in some cases, about 5m to 10m, which are selected appropriately according to the size of the slope on which the protective fence 10 is to be installed and the situation.

[0030] The protective fence 10 of this embodiment comprises a plurality of posts 20-1 to 20-4, a net 12, an auxiliary rope 14, and a buffer means 16 attached to the auxiliary rope 14. Although four posts 20-1 to 20-4 are shown in the illustrated example, the number of posts 20 is not limited to this and may be two or more. The multiple posts 20 are installed on the ground at predetermined intervals to stretch the net 12, and form one post row. Each post 20 has a post structure 1 including a base 30, an anchor bolt 36, a base plate 40 with a long hole 42 formed therein, and a post body 22. Each member constituting the protective fence 10 will be described in detail below.

[0031] The net 12 is a wire material made of steel wires (for example, a wire material made of high-tensile hard steel wires or a wire material made by twisting a plurality of high-tensile hard steel wires) formed into a net shape as shown in Fig. 1. The net 12 in the illustrated example is a diamond-shaped wire mesh with diamond-shaped mesh, but is not limited thereto, and various types of nets 12 can be used, such as a ring net made of wires formed into a ring shape (for example, a ring shape with a diameter of 300 to 400 mm).

[0032] The auxiliary rope 14 is stretched at a predetermined height between at least two of the multiple pillars 20-1 to 20-4. The auxiliary rope 14 is provided with a buffer means 16 that allows the auxiliary rope 14 to stretch within a predetermined range when a load is applied due to falling rocks or the like. As shown in FIG. 1, in this embodiment, five auxiliary ropes 16 are horizontally stretched at intervals in the vertical direction between two pillars 20-1, 20-4 located at both ends of the pillar row. Each auxiliary rope 14 is stretched with a certain tension by a fixing member 15 provided on each side of the two pillars 20-1, 20-4. A buffer means 16 is provided near both ends of each auxiliary rope 14.

[0033] 2, the buffer means 16 has a configuration in which the auxiliary rope 14 is first inserted through a metal fastening member 17 having a hole 17a through which two auxiliary ropes 14 can pass, the auxiliary rope 14 is wound once in a loop, and then the auxiliary rope 14 is again inserted through the hole 17a from the same direction, and the fastening member 17 is crimped to fix it to the inserted auxiliary rope 14. As a result, the auxiliary ropes 14 are in frictional contact with each other within the hole 17a.

[0034] In a net 12 equipped with such buffer means 16, when the impact load due to falling rocks is transmitted to the auxiliary ropes 14, the impact energy is absorbed by friction generated within the holes 17a between the auxiliary ropes 14 and between the auxiliary ropes 14 and the fastening members 17. This action reduces the diameter of the annular portion of the buffer means 16, and the auxiliary ropes 14 are shifted toward the center of the protective fence 10 by the reduced diameter, thereby increasing resistance to falling rocks. The size of the annular portion of the auxiliary ropes 14 can be changed as appropriate to obtain the desired buffer effect, and when a larger buffer effect is required, the annular portion can be made larger. Note that any buffer means can be used, not just the example shown in Figure 2.

[0035] As shown in FIGS. 3 and 4, the support pillar 20 includes a base 30 constructed on the ground, a plurality of anchor bolts 36 having tips protruding from an upper surface 30a of the base 30, and a base plate 40 placed on the base 30. , base The support structure 1 includes a support body 22 that is installed on a base 30 via a plate 40. The substrate 40 is configured to be movable relative to the base 30 when a load of a predetermined value or more is applied. In Fig. 4 and Fig. 5 described later, a part of the base 30 is cut away and viewed from above to make it easy to understand the movement state of the substrate 40.

[0036] The base 30 serves as the foundation of the support 20. In this embodiment, the base 30 is made of a concrete foundation 31 constructed on a ground slope. By forming the base 30 from a solid concrete foundation 31 in this manner, the base 30 on which the support body 22 is installed can be stabilized. A plurality of anchor bolts 36 are embedded and fixed in the concrete foundation 31. The plurality of anchor bolts 36 are disposed in accordance with the positions of a plurality of long holes 42 formed in the substrate 40. In this embodiment, the surface of the base 30 on which the substrate 40 is placed is formed as a substantially horizontal plane, but the surface of the base 30 may be inclined with respect to the horizontal plane.

[0037] The base plate 40 is a plate material placed on the base 30, and has a plurality of long holes 42 through which the plurality of anchor bolts 36 pass. The base plate 40 can be made of a high-strength material, for example, a metal plate material such as a steel plate.

[0038] The multiple long holes 42 extend in the same direction so as to extend long from the mountain side to the valley side of the ground slope when the substrate 40 is installed on the foundation 30. In this embodiment, as shown in FIG. 4, the support body 22 is erected in the center of the substrate 40, and four long holes 42 are provided around the support body 22 so as to surround the support body 22. The extension direction of the long holes 42 is approximately the same as the direction in which the substrate 40 receives an impact load due to falling rocks or the like through the support body 22. The number of long holes 42 is not limited to four, and may be two or more. In addition, it is preferable that the long holes 42 are provided on the mountain side and the valley side of the ground slope with respect to the support body 22.

[0039] The longitudinal length of the long hole 42 may be, for example, 0.5 to 0.7 times the diameter of the support 22. The length of the long hole 42 is preferably 300 mm or less, and in this embodiment, the length of the long hole 42 is set in the range of 100 mm to 300 mm.

[0040] Furthermore, it is preferable that the length of the width of the elongated hole 42 (i.e., the length in the direction perpendicular to the longitudinal direction) is set to a size that allows some margin with respect to the diameter of the anchor bolt 36, for example, 1.5 to 2 times the diameter of the anchor bolt 36. By allowing some margin in the length of the width of the elongated hole 42 in this way, it is possible to allow movement of the elongated hole 42 in the width direction as well as movement of the elongated hole 42 in the longitudinal direction when the substrate 40 moves relative to the base 30.

[0041] The pillar body 22 is a columnar body made of a highly rigid material such as steel, and is erected with its lower end fixed to the substrate 40. In this embodiment, the pillar body 22 is formed to have a square cross section, but the cross section is not limited to this and may be circular or another polygonal shape. In this embodiment, the lower end of the pillar body 22 is welded to the substrate 40. 40The pillar body 22 in this embodiment is further supported by a highly rigid rod-shaped support member 24. One end of the support member 24 is joined to the upper surface of the substrate 40, and the other end is joined to the pillar body 22. The length of the pillar body 22 can be, for example, 1.5 m to 3.5 m.

[0042] The base plate 40 to which the pillar body 22 is fixed is fixed to the base 30 with each of the anchor bolts 36 passing through each of the long holes 42 and each anchor bolt 36 positioned at the valley side end of each long hole 42. In this embodiment, the base plate 40 is fixed to the base 30 by tightening a fixing nut 37 to each anchor bolt 36. This fixing force is set to an extent that the base plate 40 can move on the base 30 along the long holes 42 when the base plate 40 receives a load of a predetermined value or more on the valley side.

[0043] Next, there will be described the operation of the protective fence 10 having the above-mentioned support structure 1. When falling rocks or collapsed earth and sand occur and the protective fence 10 receives them, an impact load acts on the net 12 and the supports 20.

[0044] In the protective fence 10 of this embodiment, the support body 22 is erected on the upper surface of the base plate 40, so that when an impact load acts on the support body 22, the impact load acts on the base plate 40 through the support body 22 toward the ground slope valley side. As described above, the base plate 40 is not fixed firmly to the base 30, but is fixed loosely. Specifically, when the impact load acting on the base plate 40 reaches or exceeds a predetermined value, the base plate 40 is allowed to move on the base 30 along the long hole 42 toward the ground slope valley side upon receiving this impact load. Therefore, when the base plate 40 receives an impact load of a predetermined value or more, it moves on the base 30 together with the support body 22 toward the valley side as shown in FIG. 5, and thus it is possible to absorb the impact energy due to falling rocks, etc. In this way, in the pillar structure 1 of this embodiment, the entire pillar body 22 is designed to be movable relative to the base 30, so that even if an impact load acts on any part of the pillar body 22 in the vertical direction, the pillar body 22 can be displaced relative to the base 30 to absorb the impact energy.

[0045] Second embodiment Fig. 6 is a cross-sectional view showing the main part of the support structure of the second embodiment, and Fig. 7 is a plan view of the support structure of the second embodiment seen from above. In Fig. 6 and Fig. 7, the same reference numerals are used for parts corresponding to those of the first embodiment. In the second embodiment described below, detailed description of the same configuration as that of the first embodiment will be omitted.

[0046] In the pillar structure 1 of this embodiment, the base 30 includes a concrete foundation 31 provided on a ground slope, and a reinforcing plate 32 installed on the concrete foundation 31. The pillar structure 1 also includes a friction control plate 50 disposed between the base 30 and the base plate 40, a stopper member 52 fixed to the base 30, and a brake means 54 attached to the base plate 40.

[0047] The reinforcing plate 32 is installed on the concrete foundation 31 and forms the upper surface of the base 30 on which the substrate 40 is placed. The reinforcing plate 32 can be formed of a material with high surface friction strength, such as a metal plate such as a steel plate. The reinforcing plate 32 of this embodiment includes a flat body 33 and a frame 34 protruding upward from the outer periphery of the body 33. The surface of the body 33 is smoother than the upper surface of the concrete foundation 31. The reinforcing plate 32 may have only the body 33. The reinforcing plate 32 of this embodiment is embedded in the concrete foundation 31 with the tip of the frame 34 protruding from the upper surface of the concrete foundation 31. The multiple anchor bolts 36 protrude from the upper surface of the base 30 in a manner that penetrates the body 33 of the reinforcing plate 32.

[0048] The friction control plate 50 controls the frictional resistance between the base 30 and the substrate 40, and in this embodiment, can be formed of a member that increases the frictional resistance between the reinforcing plate 32 and the substrate 40, such as a plate material made of resin or fiber-reinforced resin. In this embodiment, the friction control plate 50 is fitted into the frame portion 34 of the reinforcing plate 32 and fixed to the base 30. Note that the installation mode of the friction control plate 50 is not limited to this, and for example, it may be configured to be joined to the lower surface of the substrate 40 and move together with the substrate 40 relative to the base 30.

[0049] The stopper member 52 restricts the movement of the substrate 40 toward the ground slope valley side, and is installed on the valley side of the substrate 40 in a manner protruding from the upper surface of the base 30. The stopper member 52 may be any member capable of stopping the movement of the substrate 40 by contacting the substrate 40 when the substrate 40 moves on the base 30, and the shape of the stopper member 52 may be appropriately selected from a plate-like or rod-like shape, and the material of the stopper member 52 may be appropriately selected from a metal, a resin, a fiber-reinforced resin, a concrete, or the like. The stopper member 52 of this embodiment is formed from a part of the frame 34 of the reinforcing plate 32, specifically, one side of the rectangular frame 34 on the ground slope valley side.

[0050] As shown in Figs. 6 to 8, the brake means 54 includes at least one rope 55 and two plate-like members 56, 57. The brake means 54 of this embodiment uses two ropes 55. One end of each rope 55 is attached to the base plate 40 by a fixing member 59, and the other end is a free end. Each rope 55 is sandwiched between two plate-like members 56, 57, and the two plate-like members 56, 57 are firmly stacked and fixed to each other by a fastening member 58. One of the two plate-like members 56, 57, the plate-like member 57, is flat, and the other plate-like member 56 has a groove 56a having an arc-shaped cross section through which each rope 55 is inserted when the plate-like member 57 is stacked. The plate-like members 56, 57 of this embodiment are fixed to the base 30 via a friction control plate 50.

[0051] When the substrate 40 moves relative to the base 30, the ropes 55 of this brake means 54 are pulled by the substrate 40, and the ropes 55 move together with the substrate 40 while rubbing against the inner surfaces of the plate-like members 56, 57. This generates a frictional force between the plate-like members 56, 57 and the ropes 55, absorbing the movement energy of the substrate 40.

[0052] In the protective fence 10 of this embodiment, the friction control plate 50 disposed in the support 20 between the base 30 and the substrate 40 can control the frictional resistance when the substrate 40 moves relative to the base 30, and for example, the frictional resistance can be increased by the friction control plate 50. This makes it possible to increase the amount of absorption of impact energy acting on the support 20.

[0053] Furthermore, when the substrate 40 moves, a frictional force is generated between the lobe 55 and the plate-like members 56, 57 in the brake means 54 attached to the substrate 40. In this way, by generating a frictional force by the brake means 54, it is possible to more effectively absorb impact energy.

[0054] In addition, in this support structure 1, the stopper member 52 fixed to the base 30 can regulate the moving distance of the substrate 40. Therefore, even if the support body 22 receives a large impact force due to a rockfall or the like and a large impact load acts on the substrate 40, the long hole 42 formed in the substrate 40 and the stopper member 52 can both regulate the moving distance of the substrate 40. 0 The movement of the object can be stopped reliably.

[0055] Furthermore, in this embodiment, the substrate 40 is placed on the reinforcing plate 32 and is not in direct contact with the concrete foundation 31, so that when the substrate 40 moves over the base 30, the frictional force generated between the substrate 40 and the concrete foundation 31 can be prevented from collapsing the surface of the concrete foundation 31.

[0056] (Third embodiment) Fig. 9 is a perspective view of a protective fence 10 equipped with a support structure 1 of the third embodiment, Fig. 10 is a cross-sectional view showing a main part of the support structure 1 of the third embodiment, and Fig. 11 is a plan view of a support 20 of the third embodiment seen from above. In the third embodiment shown in Figs. 9 to 12, parts corresponding to those in the first or second embodiment are given the same reference numerals. In the third embodiment described below, detailed description of the same configuration as the first or second embodiment will be omitted.

[0057] In the support structure 1 of this embodiment, the support body 22 is tiltably mounted on a base plate 40 via a hinge 26. In addition, a biasing means 48 is attached to the base plate 40 for biasing the base plate 40 toward the mountain side of the ground slope. The protective fence 10 of this embodiment comprises a plurality of support poles 20-1 to 20-4, a net 12, an auxiliary rope 14, and a buffer means 16 attached to the auxiliary rope 14, as well as an upper support rope 70, a lower support rope 72, a holding rope 74, and a support rope 76.

[0058] As shown in Fig. 9, the upper support rope 70 and the lower support rope 72 are laid horizontally on the upper and lower ends of the column row, respectively. The upper support rope 70 is laid from one anchor 79 fixed to the ground slope, passing through the upper parts of each of the columns 20-1 to 20-4, to the other anchor 79. The lower support rope 72 is laid from one anchor 79 fixed to the ground slope, passing through the lower parts of each of the columns 20-1 to 20-4, to the other anchor 79. The upper support rope 70 and the lower support rope 72 are located on the upper and lower sides of the net 12, respectively.

[0059] Of the multiple pillars 20-1 to 20-4 that form the pillar row, the inner pillars 20-2, 20-3 excluding the pillars 20-1, 20-4 at both ends have holding ropes 74 stretched from the tops of the pillars to anchors 79 fixed to the ground on the mountainside. In this embodiment, two holding ropes 74 are provided for each of the pillars 20-2, 20-3, and these holding ropes 74 enable the pillars 20-2, 20-3 to be stably erected and the tilting movement of the pillars 20-2, 20-3 to be adjusted.

[0060] The upper support ropes 70, the lower support ropes 72, the holding ropes 74, and the supporting ropes 76 are provided with shock absorbing means 78. The shock absorbing means 78 has a similar structure to the shock absorbing means 16 shown in Fig. 2, and absorbs the sudden impact force when a rock falls, preventing each rope from breaking.

[0061] 10 and 11, the hinge 26 provided between the substrate 40 and the support body 22 includes a fixed plate 27 fixed to the substrate 40 and standing upright therefrom, and a shaft portion 28 attached to the fixed plate 27. The fixed plates 27 are arranged in pairs so as to sandwich the support body 22. The shaft portion 28 penetrates the support body 22 and the pair of fixed plates 27, and the support body 22 is installed on the substrate 40 so as to be tiltable about the shaft portion 28.

[0062] The biasing means 48 is attached to the substrate 40, and applies a biasing force to the substrate 40 to bias the substrate 40 toward the mountain side at least when the substrate 40 moves toward the valley side on the base 30. The biasing means 48 is formed of an elastic member, and is attached to the substrate 40 so as to be able to expand and contract in the extension direction of the long hole 42 in the installed state. For example, a coil spring or a plurality of stacked disc springs can be used as the biasing means 48. In this embodiment, a coil spring having one end connected to the substrate 40 and the other end connected to the frame portion 34 of the reinforcing plate 32 is used as the biasing means 48. In this embodiment, as an example, two coil springs as the biasing means 48 are provided on each of the valley side and the mountain side of the substrate 40. The coil springs may be set to a natural length without expansion or contraction in the initial installation state of the support 20, or may be installed in an expanded or contracted state so as to bias the substrate 40 toward the mountain side. In this embodiment, the stopper member 52 is installed and fixed on the upper surface of the friction plate 52 fixed to the reinforcing plate 32. By providing the biasing means 48, it is possible to easily control the sliding load when the substrate 40 moves. In addition, the biasing means 48 allows easy maintenance after the substrate 40 has moved.

[0063] Next, the operation of the guard fence 10 of the third embodiment will be described with reference to FIG. 12. FIG. 12 is a side view of the guard fence 10, showing the state in which the collapsed soil 60 is received by the net 12 of the guard fence 10. In FIG. 12, the dashed lines indicate the initial positions of the support pillar body 22 and the base plate 40. When the support pillar body 22 and the base plate 40 receive an impact load of a predetermined value or more due to the collapsed soil 60, the support pillar body 22 moves together with the base plate 40 toward the valley side of the ground slope S, and is tilted relative to the base plate 40 by the hinge structure provided at the lower end of the support pillar body 22. In this way, by tilting the support pillar body 22 in addition to the lateral movement of the base plate 40 and the support pillar body 22, a larger impact energy can be absorbed. In addition, the hinge 26 can eliminate the moment acting on the base plate 40, that is, the force acting in the direction in which the base plate 40 moves away from the base 30, and this makes it easier to control the load acting on the base plate 40 in the moving direction.

[0064] Furthermore, when the substrate 40 moves relative to the base 30, the biasing means 48 attached to the substrate 40 expands and contracts the substrate 40, and the movement energy of the substrate 40, i.e., the impact energy received by the support body 22, is absorbed by the biasing means 48. In this way, the energy absorption efficiency can be further improved by absorbing the impact energy by the expansion and contraction of the biasing means 48.

[0065] In this embodiment, the surface of the base 30 of the support 20 is inclined upward from the crest to the valley by a predetermined angle α with respect to the horizontal plane, as shown in Fig. 12. By providing the base 30 with such an inclination, the amount of energy absorbed during the movement of the substrate 40 can be increased.

[0066] (Fourth embodiment) Fig. 13 is a cross-sectional view showing a main part of a pillar structure 1 of the fourth embodiment, and Fig. 14 is a plan view of a pillar 20 of the fourth embodiment seen from above. In the fourth embodiment shown in Figs. 13 and 14, parts corresponding to those in the first, second or third embodiment are given the same reference numerals. In the fourth embodiment described below, detailed description of the same configuration as the first, second or third embodiment will be omitted.

[0067] In the support structure 1 of this embodiment, the base plate 40 on which the support body 22 is erected is clamped and fixed by the base 30 and the clamping plate 46 placed on the base plate 40. Specifically, the base 30 includes a concrete foundation 31 and a friction control plate 50, the base plate 40 is placed on the upper surface of the friction control plate 50, and the clamping plate 46 is placed on the upper surface of the base plate 40. In the illustrated example, the friction control plate 50 and the clamping plate 46 are set to be equal in size. A plurality of anchor bolts 38 are embedded and fixed in the base 30 so that their tips protrude from the upper surface. Each anchor bolt 38 has a nut 39 tightened from above the clamping plate 46 in a state where it penetrates the friction control plate 50 and the clamping plate 46, and the base plate 40 is clamped and fixed by tightening the nut 39.

[0068] The clamping plate 46 is preferably formed of a plate material having high strength and hardness, such as a steel plate. The friction control plate 50 is preferably formed of a plate material having a lower hardness (softer) than the clamping plate 46, such as an aluminum alloy plate or a fiber-reinforced resin plate. In this embodiment, the friction control plate 50 is formed of a material softer than the substrate 40 so that the hardness of the friction control plate 50 is lower than that of the substrate 40. With this configuration, when the substrate 40 moves, the surface of the friction control plate 50 having a low hardness is deformed or damaged, thereby increasing the amount of energy absorption. In addition, during maintenance, only the damaged friction control plate 50 of the substrate 40 and the friction control plate 50 can be replaced.

[0069] Furthermore, by installing the friction control plate 50, the friction resistance occurring on the underside of the substrate 40 can be controlled. Specifically, since the concrete foundation 31 is cast at the installation site, it is difficult to control the unevenness of its surface, and if the substrate 40 is placed directly on the concrete foundation 31, the friction resistance between the substrate 40 changes significantly depending on the unevenness. By installing the friction control plate 50 between the concrete foundation 31 and the substrate 40 as in this embodiment, it is possible to control the friction resistance occurring on the underside of the substrate 40 when the substrate 40 moves toward the valley side, and thus it is possible to control the substrate 40 to move when it reaches a predetermined sliding load.

[0070] A long hole 47 is formed in the center of the clamping plate 46, which extends from the mountain side to the valley side of the ground slope, and the support body 22 is erected on the base plate 40 with the long hole 47 passing through it. In this embodiment, a hinge 26 is provided at the lower end of the support body 22, and the hinge 26 passes through the long hole 47 of the clamping plate 46. The base plate 40 and the support body 22 are arranged so that the support body 22 is located at the end of the long hole 47 on the mountain side of the ground slope in the initial installation state. The fixing force of the base plate 40 to the base 30 by the nut 39 is set to such an extent that the base plate 40 can move on the base 30 along the long hole 47 of the clamping plate 46 when the base plate 40 receives a load of a predetermined value or more toward the valley side.

[0071] In this pillar structure 1, when a collision load is applied to the pillar body 22 due to falling rocks or the like, the collision load acts on the base plate 40 via the pillar body 22 toward the ground slope valley side. When this collision load reaches a predetermined value or more, the base plate 40 moves on the base 30 along the long hole 47 of the clamping plate 46 together with the pillar body 22 toward the ground slope valley side, thereby absorbing the impact energy due to falling rocks or the like. Impact energy can also be absorbed by tilting the pillar body 22 via the hinge 26.

[0072] In this embodiment, the distance that the substrate 40 moves toward the valley side of the ground slope relative to the base 30 can be restricted by the longitudinal length of the long hole 47. Although not shown, in this embodiment, a stopper member 52 protruding from the upper surface of the valley side of the friction control plate 50 or the lower surface of the valley side of the clamping plate 46 may be provided, so that the substrate 40 comes into contact with the stopper member 52 to restrict the movement of the substrate 40 toward the valley side.

[0073] Fifth embodiment Fig. 15 is a cross-sectional view showing a main part of the pillar structure 1 of the fifth embodiment, and Fig. 16 is a cross-sectional view taken along line AA in Fig. 15. In the fifth embodiment shown in Figs. 15 and 16, parts corresponding to those in the first, second or third embodiment are given the same reference numerals. In the fifth embodiment described below, detailed description of the same configuration as in the first, second or third embodiment will be omitted.

[0074] In the support structure 1 of this embodiment, a pair of clamping plates 70A, 70B are erected and fixed on the reinforcing plate 32 forming the surface of the base 30 so that the surface of the plate is perpendicular to the reinforcing plate 32, and the substrate 40 is clamped and fixed by these clamping plates 70A, 70B. In this embodiment, a pair of friction control plates 50A, 50B are attached to the inner surfaces of the pair of clamping plates 70A, 70B, and the substrate 40 is clamped and held by the clamping plates 70A, 70B via the friction control plates 50A, 50B. The friction control plates 50A, 50B control the friction resistance between the clamping plates 70A, 70B and the substrate 40, and the material of the friction control plates 50A, 50B can be the same as that of the friction control plate 50 of the second embodiment. Note that the friction control plates 50A, 50B are optional and are not essential components.

[0075] The reinforcing plate 32 is fixed to the surface of the concrete foundation 31 by an anchor bolt 38 that protrudes from the concrete foundation 31 and penetrates the reinforcing plate 32, and a nut 39 that is fastened to the anchor bolt 38. The pair of clamping plates 70A, 70B are arranged parallel to each other at a predetermined interval and are formed in a rectangular shape that extends long from the mountain side to the valley side. The base plate 40 is arranged so that the surface of the plate is perpendicular to the reinforcing plate 32, and is fixed by the pair of clamping plates 70A, 70B with a predetermined fixing force, that is, a fixing force that allows the base plate 40 to move on the foundation 30 toward the valley side when the base plate 40 receives a load of a predetermined value or more toward the valley side of the ground slope. The support body 22 is installed on the base plate 40 so as to be able to tilt via the hinge 26. The pair of fixing plates 27 that constitute the hinge 26 are attached so as to sandwich both surfaces of the base plate 40.

[0076] The substrate 40 is fixed to the base 30 with a predetermined fixing force by a fastening force of a plurality of bolts 76 that penetrate the pair of clamping plates 70A, 70B, the pair of friction control plates 50A, 50B, and the substrate 40, and a plurality of nuts 78 that are screwed onto these bolts 76. Each bolt 76 penetrates an elongated hole 72 formed in the clamping plates 70A, 70B and an elongated hole 51 formed in the friction control plates 50A, 50B. The elongated holes 7 of the clamping plates 70A, 70B and the elongated holes 51 of the friction control plates 50A, 50B each extend long from the crest side to the valley side, and are formed to be approximately equal in size and shape so that the holes overlap in the thickness direction. The inner diameter of the hole through which the bolt 76 penetrates in the substrate 40 is set to be approximately equal to the outer diameter of the bolt 76. In this embodiment, when a load equal to or greater than a predetermined value acts on the substrate 40, the substrate 40 and the bolts 76 move along the long holes 72, 51 from the crest side to the valley side relative to the base 30 and the clamping plates 70A, 70B firmly fixed thereto.

[0077] The long holes 72, 51 that restrict the movement of the bolts 76 may be configured to be formed on the substrate 40 side (i.e., the side that moves relative to the base 30) rather than on the clamping plates 70A, 70B side (i.e., the side that is firmly fixed to the base 30 and does not move). Also, the friction control plates 50A, 50B may be configured to be attached to both surfaces of the substrate 40 rather than to the clamping plates 70A, 70B.

[0078] The present invention is not limited to the above-described embodiments, and various modifications are possible without departing from the spirit of the invention.

[0079] For example, in the embodiment shown in Fig. 7, a destructible member that receives a load from the substrate 40 and breaks when the substrate 40 moves to the valley side may be provided in an area 68 on the valley side of the substrate 40 and within the movement range of the substrate 40. The destructible member is made of a highly brittle material, and can be made of, for example, a resin material, a rubber material, or an aerated concrete containing a large number of air bubbles, such as air mortar. Such a destructible member can also be applied to the other embodiments described above.

[0080] Fig. 17 shows a modified example of the support structure 1 equipped with a destructible member. In this modified example, the shape of the substrate 40 in the second embodiment is changed, and plate-shaped destructible members 66 are provided on both sides of the substrate 40. In Fig. 17, the non-destructible members 66 are marked with dots for ease of understanding. The configuration of the other members is the same as in the second embodiment.

[0081] The substrate 40 of this modified example is formed in a trapezoid shape with the width dimension of the valley side set smaller than the width dimension of the mountain side. In the illustrated example, the substrate 40 is formed in an isosceles trapezoid that is an axisymmetric trapezoid in a plan view. The destructible member 66 is placed on the reinforcing plate 32 via the friction control plate 50, and is fixed and installed in a state of contact with both sides of the substrate 40 (i.e., the side edges that form a pair of legs of the trapezoid), and is disposed so as to fill the gap between both sides of the substrate 40 and the frame portion 34 of the reinforcing plate 32.

[0082] In the support structure 1 shown in Fig. 17, when the substrate 40 receives a load of a predetermined value or more toward the valley side, the substrate 40 moves toward the valley side while destroying the destructible members 66 arranged on both sides. By destroying the destructible members 66 in this way, it is possible to absorb the impact energy and mitigate the impact on the support body 22. Note that such destructible members 66 can be applied to other embodiments by changing the shape of the substrate 40 to a trapezoidal shape and providing a frame portion 34 for fixing the destructible members 66.

[0083] As in the above-mentioned embodiments and modifications, the support structure 1 according to the present invention preferably comprises a fixing mechanism that fixes the substrate 40 to the base 30 with a predetermined fixing force (i.e., a fixing force such that the substrate 40 can move on the base 30 toward the valley side when a load of a predetermined value or more acts on the valley side of the ground slope), and a guide mechanism that guides the movement of the substrate 40 so that the substrate 40 moves toward the valley side within a predetermined distance when a load of a predetermined value or more acts on the substrate 40 and the substrate 40 is released from the fixation to the base 30. The guide mechanism preferably comprises a long hole formed in either the substrate 40 or the fixing mechanism, and a penetrating member attached to the other of the substrate 40 or the fixing mechanism, which passes through the long hole and moves within the long hole in the elongation direction of the long hole.

[0084] In the first, second and third embodiments, the fixing mechanism is configured with an anchor bolt 36 attached to the base 30 and a nut 37 fastened to the anchor bolt 36 while sandwiching the substrate 40 between the base 30 and the anchor bolt 36, and the guide mechanism is configured with an elongated hole 42 formed in the substrate 40 and the anchor bolt 36 penetrating the elongated hole 42. In the second and third embodiments, the stopper member 52 further constitutes a guide mechanism that restricts the movement of the substrate 40 toward the valley side. In the fourth embodiment, the fixing mechanism is configured with a clamping plate 46 that clamps the substrate 40 together with the base 30, and the anchor bolt 36 and nut 39 that apply a clamping force to the clamping plate 46, and the guide mechanism is configured with an elongated hole 47 formed in the clamping plate 46 and a support body 22 penetrating the elongated hole 47. In addition, in the fifth embodiment, the fixing mechanism is configured to include a pair of clamping plates 70A, 70B fixed to the base 30, and a bolt 76 and a nut 78 that fix the substrate 40 to the clamping plates 70A, 70B with a predetermined fixing force, and the guide mechanism is configured to include a long hole 72 formed in the clamping plates 70A, 70B, and a bolt 76 that passes through the long hole 72.

[0085] In addition, in the support structure 1 according to the present invention, the reinforcing plate 32, the friction control plate 50, the stopper member 52, the brake means 54, the hinge 28, the biasing means 48 and the destructible member 66 are not essential components, and the support structure 1 according to the present invention can use any one or a combination of a plurality of these. Also, the support body 22 of the first embodiment shown in Fig. 1 may be provided with a holding rope 74 and a buffer member 78 shown in Fig. 9, which can suppress the moment acting on the support body 22 and absorb impact loads. [Explanation of symbols]

[0086] 1 pillar structure 10 Protective fence 12. Net 20 pillars 22 Pillar body 24 Support member 26 Hinge 28 Shaft 30 Foundation 31 Concrete Foundation 32 Reinforcement plate 36,38 Anchor bolts 37,39 Nut 40 Substrate 42 long hole 48 Actuation means 50 Friction control plate 52 Stopper member 54 Braking means 55 Rope 56,57 Plate-shaped members 66 Destructible Members 70A,70B,76 Holding plate

Claims

1. A post structure for a protective fence that is installed on the ground at a predetermined interval in order to stretch a protective net, the post structure comprising a base constructed on the ground and a post body installed on the base, A substrate that is directly or indirectly placed on the base and has the support body erected on an upper surface thereof; a guide mechanism that guides the movement of the base plate and the support body on the base from the mountain side to the valley side of the ground slope; a destructible member that is provided on the base and that is destroyed by a load from the base when the base plate and the support body move; The guide mechanism includes: a slot provided in the substrate and extending from the peak side to the valley side; an anchor bolt that is fixed to the base, has a tip portion protruding from an upper surface of the base, and passes through the long hole while being positioned at an end portion of the long hole on the valley side; This is a protective fence support structure, characterized in that the base plate is fixed to the foundation with a fixing force that allows the base plate and the support body to move toward the valley side, guided by the guide mechanism, when the protective fence captures a falling rock and a load of a predetermined value or more is applied to the base plate toward the valley side, by screwing a nut onto the anchor bolt.

2. A post structure for a protective fence that is installed on the ground at a predetermined interval in order to stretch a protective net, the post structure comprising a base constructed on the ground and a post body installed on the base, A substrate that is directly or indirectly placed on the base and has the support body erected on an upper surface thereof; a guide mechanism that guides the movement of the base plate and the support body on the base from the mountain side to the valley side of the ground slope; a rope having one end attached to the base plate and movable toward the valley side together with the base plate, and two plate-like members fixed to the base and sandwiching the rope on the mountain side of the base plate; and a brake means for generating a frictional force between the rope and the two plate-like members when the base plate moves; The guide mechanism includes: a slot provided in the substrate and extending from the peak side to the valley side; an anchor bolt that is fixed to the base, has a tip portion protruding from an upper surface of the base, and passes through the long hole while being positioned at an end portion of the long hole on the valley side; This is a protective fence support structure, characterized in that the base plate is fixed to the foundation with a fixing force that allows the base plate and the support body to move toward the valley side, guided by the guide mechanism, when the protective fence captures a falling rock and a load of a predetermined value or more is applied to the base plate toward the valley side, by screwing a nut onto the anchor bolt.

3. 3. The support structure according to claim 1, further comprising a friction control plate disposed between the substrate and the base, for controlling frictional resistance between the substrate and the base.

4. The support structure according to any one of claims 1 to 3, characterized in that the base comprises a concrete foundation provided on a ground slope, and a metal reinforcing plate installed on the concrete foundation and on which the substrate is directly or indirectly placed.

5. A support structure as described in Claim 4, characterized in that one end is attached to the substrate and the other end is attached to a frame portion protruding upward from the outer peripheral edge portion of the reinforcing plate, and the support structure is provided with a biasing means which expands or contracts when the substrate moves toward the valley side, thereby biasing the substrate toward the mountain side.

6. 6. The support structure according to claim 1, wherein the support body is tiltably mounted on the substrate via a hinge.

Images