Guardrail

Abstract

To provide a guard fence which is easy to install and remove, and excellent in durability.SOLUTION: A guard fence 1 has three concrete blocks 10, four pillars 20, a guardrail plate 30, restraint tools 40, and connectors 50. The guardrail plate 30 is supported via brackets 60, and adjacent concrete blocks 10 are connected via the connectors 50. The pillars 20 are inserted into pillar holes. By penetrating both the pillars 20 and the concrete block 10 with the restraint tools 40, the pillars 20 are kept connected to the concrete blocks 10.SELECTED DRAWING: Figure 1

Description

Technical Field

[0001] The present invention relates to a protective fence having a concrete block as a foundation structure.

Background Art

[0002] In Patent Document 1, a protective fence foundation is proposed in which an annular connecting portion is provided at an end portion of a substantially rectangular parallelepiped concrete block as a protective fence foundation for connecting columns. By overlapping the connecting portion with the annular connecting portion of another protective fence foundation and inserting the column of the protective fence into the overlapping connecting portion, a plurality of protective fence foundations can be connected.

[0003] In Non-Patent Document 1, a protective fence foundation is proposed in which continuous foundations can be constructed by vertically combining the end portions of concrete foundations and connecting them with one bolt. The connection between the protective fence foundation and the column of the protective fence is such that the column is inserted into a hole provided in the foundation of the protective fence, and sand, mortar, or dry-mixed mortar is filled in the gap between the hole and the column, whereby the protective fence foundation and the column are connected.

Prior Art Documents

Patent Documents

[0004]

Patent Document 1

Non-Patent Documents

[0005]

Non-Patent Document 1

Summary of the Invention

Problems to be Solved by the Invention

[0006] However, since the guardrail foundation proposed in Patent Document 1 is provided with an annular connecting portion for connecting the columns at the ends, it can be assumed that it will be easily deformed if the connecting portion is impacted for some reason. Due to this deformation, it becomes difficult to insert the column into the connecting portion.

[0007] For the guardrail foundation proposed in Non-Patent Document 1, it is necessary to connect the column and the concrete block following the procedure of building the column into the hole provided in the guardrail foundation and filling the gap generated between the column and the hole with dry-mixed mortar. Filling the dry-mixed mortar without gaps is a process that requires a long time. Also, it is necessary to maintain the installation accuracy of the column until the dry-mixed mortar is filled. Moreover, when removing, it will also take a long time to remove the dry-mixed mortar filled in the hole.

[0008] The present invention has been made paying attention to these problems, and provides a guardrail that is easy to install and remove and has excellent durability.

Means for Solving the Problems

[0009] The invention for solving the above problems is a guardrail, comprising a column, a guardrail plate supported by the column, a concrete block provided with a column hole into which the column can be inserted and removed, and a restraint for restraining the column inserted into the column hole from coming out by penetrating both the column and the concrete block.

[0010] According to this configuration, the column can be connected to the concrete block in a short time and easily by passing the restraint through both the column and the concrete block. Also, the column will not come out of the column hole unless the restraint is damaged.

[0011] Preferably, the column is provided with a through-hole, the concrete block is provided with a fixing hole connected to the through-hole, and the restraint is characterized by passing through both the through-hole and the fixing hole and being tightened on both side surfaces of the concrete block.

[0012] According to this configuration, by passing the restraint through both the through-hole and the fixing hole, the column and the concrete block can be connected in a short time and easily. Further, since the restraint is fastened on both side surfaces of the concrete block, it is possible to prevent the restraint from falling off the concrete block.

[0013] Preferably, the guardrail plate is supported by the column via a bracket, and the bracket has a pair of guardrail fixing members fixed to the guardrail plate, a column fixing member fixed to the column, and a pair of bracket members. The bracket member is connected to one end of the guardrail fixing member at the first connection portion and connected to both end portions of the column fixing member at the second connection portion, and the connection length of the first connection portion is shorter than the connection length of the second connection portion.

[0014] According to this configuration, the bracket member is connected to one end of the guardrail fixing member at the first connection portion and connected to both end portions of the column fixing member at the second connection portion, and the connection length of the first connection portion is shorter than the connection length of the second connection portion. Therefore, by appropriately setting the connection length of the first connection portion and the connection length of the second connection portion, when a vehicle or the like collides with the guardrail plate, the connection state between the column and the bracket can be maintained, and the impact force received by the column can be reduced by deforming the bracket member near the first connection portion.

[0015] Preferably, the concrete block is provided with a male part side surface defining a male part at one end in the longitudinal direction and a female part side surface defining a female part into which the male part can be inserted at the other end in the longitudinal direction, and the male part side surface and the female part side surface are provided from the upper surface to the lower surface of the concrete block.

[0016] According to this configuration, the concrete block is provided with a male part side surface defining a male part at one end in the longitudinal direction and a female part side surface defining a female part into which the male part can be inserted at the other end in the longitudinal direction, and the male part side surface and the female part side surface are provided from the upper surface to the lower surface of the concrete block. Therefore, by arranging the concrete blocks side by side with the male part inserted into the female part, it becomes easy to position the concrete blocks.

[0017] Preferably, the male part and the female part are arc-shaped in plan view.

[0018] According to this configuration, since the male part and the female part are arc-shaped in plan view, by arranging the concrete blocks side by side with the male part inserted into the female part, the concrete blocks can rotate relative to each other.

[0019] Preferably, the male part side surface defines contact recesses connecting to both side ends of the male part, the female part side surface defines contact protrusions connecting to both side ends of the female part, and when the concrete blocks are at a predetermined angle with the male part inserted into the female part, the contact recesses and the contact protrusions contact each other to restrict the rotation of the concrete blocks.

[0020] When the protective fence is impacted by a collision of a vehicle or the like, the concrete blocks rotate relative to each other. However, according to this configuration, when the concrete blocks are at a predetermined angle, the contact protrusions of one concrete block and the contact recesses of the other concrete block contact each other to stop the rotation of the concrete blocks.

[0021] Preferably, a connecting tool for connecting the concrete blocks with the male part inserted into the female part is provided.

[0022] According to this configuration, the concrete blocks can be connected by the connecting tool.

[0023] Preferably, the connecting tool has a connecting member sized to cover the upper ends of the male part and the female part, the connecting member is provided with a plurality of arcuate elongated holes defined in an annular shape, and the concrete blocks can rotate along the arcuate elongated holes.

[0024] According to this configuration, since the concrete blocks can rotate smoothly along the arcuate elongated holes, the concrete blocks can be easily placed at a predetermined position even on a road having a planar curvature.

Brief Description of the Drawings

[0025]

Figure 1

Figure 2

Figure 3

Figure 4

Figure 5

Figure 6

Figure 7

Figure 8

Figure 9

Mode for Carrying Out the Invention

[0026] Hereinafter, embodiments of the present invention will be described in detail with reference to FIGS. 1 to 9.

[0027] As shown in FIG. 1, the protective fence 1 in this embodiment has three concrete blocks 10, four support columns 20, a guardrail plate 30, a restraint 40, and a connector 50. The guardrail plate 30 is supported via a bracket 60, and adjacent concrete blocks 10 are connected via a connector 50. The support column 20 is maintained in a state of being connected to the concrete block 10 by a restraint 40. The number of concrete blocks 10, the number of support columns 20, etc. are not restricted to this embodiment. That is, the number of concrete blocks 10 may be four or more, two, or even one. In the case of one, the connector 50 is not necessary. Also, the number of support columns 20 may be appropriately determined according to the number of concrete blocks 10.

[0028] The protective fence 1 may be installed with the concrete block 10 placed on the ground, or it may be installed with a part or all of the concrete block 10 buried in the ground. When placing the concrete block 10 on the ground, it is preferably used as a temporary protective fence because it is easy to install and remove. Also, when burying a part or all of the concrete block 10 in the ground, it is preferably used as a protective fence permanently installed on the road because the installation position can be maintained even when receiving a large impact due to a collision of a vehicle or the like.

[0029] As shown in FIGS. 2(a), (b) and 3, the column 20 is a square tube and is inserted into a column hole 11 provided in the concrete block 10. The column hole 11 is a hole that penetrates the concrete block 10 and reaches the upper surface 13 and the lower surface 14. The column hole 11 defines a hole 11c through which the square tube-shaped column 20 can be inserted and removed, and the range where the column 20 is inserted is in surface contact with the column 20. Thereby, the displacement of the column 20 in the circumferential direction and the radial direction is restricted. In the first embodiment, the shape of the column is exemplified as a square tube, but it may be a cylinder.

[0030] A protruding portion 11a surrounding the hole 11c is formed on the upper surface 13. A receiving portion 11b capable of receiving the protruding portion 11a is provided at the lower end portion of the column hole 11. The outer edge shape of the protruding portion 11a coincides with the outer edge shape of the receiving portion 11b. Thereby, when the concrete blocks 10 are stacked on top of each other, the protruding portion 11a of the concrete block 10 located in the lower layer fits into the receiving portion 11b of the concrete block 10 located in the upper layer. As a result, lateral displacement between the vertically stacked concrete blocks 10 can be avoided (see FIGS. 8(a) and (b)).

[0031] The fixing hole 12 is a hole that penetrates the concrete block 10 and reaches the side surface 15b via the column hole 11 from the side surface 15a. The restraint 40 is inserted into the fixing hole 12. Note that the side surfaces 15a and 15b are surfaces provided opposite to each other at the ends in the short side direction S of the concrete block 10.

[0032] On the opposing surfaces of the support column 20, one through-hole 21 is provided respectively. The through-hole 21 is located on the straight line along which the fixing hole 12 extends. The restraint tool 40 passes through the fixing hole 12 and the through-hole 21 and clamps the side surfaces 15a, 15b. The restraint tool 40 is a cylindrical rod member extending in the direction of the short side S, and its diameter is set to be the same as or slightly smaller than the diameters of the fixing hole 12 and the through-hole 21. Thereby, the vertical displacement of the support column 20 is restricted and it will not escape from the support column hole 11.

[0033] On one end in the longitudinal direction L, a male part side surface 16 is provided, and on the other end, a female part side surface 17 is provided from the upper surface 13 to the lower surface 14. That is, the male part side surface 16 and the female part side surface 17 have the same shape in plan view at any position between the upper surface 13 and the lower surface 14.

[0034] The male part side surface 16 defines a male part 70 that is arc-shaped in plan view and protrudes in the direction of the longitudinal direction L from one end of the concrete block 10. Further, contact concave portions 71a, 71b that connect to both side ends of the male part 70 and the side surfaces 15a, 15b are defined. The contact concave portions 71a, 71b are concave curved surfaces in plan view.

[0035] The female part side surface 17 defines a female part 72 that is arc-shaped in plan view and recesses in the direction of the longitudinal direction L from the other end of the concrete block 10. The male part 70 fits into the female part 72 with their vertical surfaces facing each other. These vertical surfaces are composed of continuous surfaces from the bottom surface to the top surface. Further, contact convex portions 73a, 73b that connect to both side ends of the female part 72 and the side surfaces 15a, 15b are defined. The contact convex portions 73a, 73b are convex curved surfaces in plan view. Also, when the concrete blocks 10 are arranged side by side as shown in FIG. 6, at the connection part, the male part 70 of one concrete block 10 and the female part 72 of the other concrete block 10 are concentrically located. The fitting angle θ between the female part 72 and the male part 70 can be appropriately changed within a predetermined range according to the construction situation.

[0036] As shown in FIG. 4, the bracket 60 is composed of a pair of guard rail fixing members 61, 61, a column fixing member 62, and a pair of bracket members 63, 63. The column fixing member 62 is connected to the column 20 in a state of facing the guard rail plate 30 (see FIG. 1). The pair of bracket members 63, 63 are bent and extended from the second connection portions 65 located at both ends of the column fixing member 62 in the direction of the guard rail plate 30. Further, the pair of guard rail fixing members 61, 61 are bent in a direction parallel to the column fixing member 62 and extend in a direction away from each other.

[0037] The guard rail fixing member 61 is a substantially rectangular flat plate, and is provided with holes 61a for bolt connection to the guard rail plate 30. The bolt 22 used for bolt connection extends in the direction of the short side S. The hole 61a is an elongated hole extending in the direction in which the guard rail plate 30 extends in order to absorb the installation error of the guard rail plate 30.

[0038] The column fixing member 62 is a substantially rectangular flat plate, and holes 62a, 62b for bolt connection to the column 20 are arranged along the direction in which the column 20 extends. The hole 62a provided above the hole 62b is a circular hole through which the bolt 22 can pass. The hole 62b is an elongated hole extending in the direction in which the guard rail plate 30 extends so that the mounting angle between the column 20 and the guard rail plate 30 can be adjusted.

[0039] The bracket member 63 is a flat plate connected to the guard rail fixing member 61 at the first connection portion 64 and connected to the column fixing member 62 at the second connection portion 65. The connection length of the first connection portion 64 is set shorter than the connection length of the second connection portion 65. By appropriately setting the connection length of the first connection portion 64 and the connection length of the second connection portion 65, when a vehicle or the like collides with the guard rail plate 30, the connection state between the column 20 and the bracket 60 can be maintained, and the impact force received by the column 20 can be reduced by deforming the bracket member 63 in the vicinity of the first connection portion 64.

[0040] As shown in FIG. 5, the connector 50 has a plate-shaped connecting member 51 provided with four arcuate elongated holes 52 on the circumference of a virtual circle 53. The connecting member 51 is slidably connected to the concrete block 10 by bolts 55 (see FIG. 6) inserted through the arcuate elongated holes 52. Further, the virtual circle 53, the male part 70, and the female part 72 are concentrically located in plan view. In a state where the male part 70 is inserted into the female part 72, adjacent concrete blocks 10 are connected via the connector 50, so that adjacent concrete blocks 10 rotate about the center 54 of the virtual circle 53 as a rotation center.

[0041] Referring to FIG. 6, the behavior of the concrete block 10 when the guardrail 1 is impacted by a collision of a vehicle or the like will be described.

[0042] When the guardrail 1 is impacted by a collision of a vehicle or the like, the concrete blocks 10 move relative to each other. Specifically, one concrete block 10 rotates clockwise about the center 54 of the connector 50, and the other concrete block 10 rotates counterclockwise about the center 54 of the connector 50. When the concrete blocks 10 reach a predetermined angle θ, the contact convex portion 73b of one concrete block 10 contacts the contact concave portion 71b of the other concrete block 10. Thereby, the rotation of the concrete blocks 10 stops.

[0043] In other words, the concrete blocks 10 can be freely arranged within a range not exceeding the predetermined angle θ. Therefore, the predetermined angle θ may be appropriately determined in consideration of the assumed planar curvature of the road where the guardrail is installed. The same applies to the arc length of the arcuate elongated hole 52.

[0044] As shown in Fig. 9, the connection structure between a conventional column and a concrete block is configured such that, for example, sand 312a and mortar 312b are filled in a laminated state in the gap between a hole 311 provided in the concrete block 310 and the column 320. In this configuration, after the concrete block 310 is installed, the column 320 is erected in the hole 311, and the column 320 and the concrete block 310 are connected following the procedure of laminating and filling sand 312a and mortar 312b in the gap generated between the column 320 and the concrete block 310. When connecting the column and the concrete block in such a procedure, a great deal of labor is required to fill the gap. Also, it is necessary to maintain the erection accuracy of the column until the mortar 312b is filled.

[0045] On the other hand, when connecting the column 20 and the concrete block 10 in the configuration of the present embodiment, after the concrete block 10 is installed, it is sufficient to insert the column 20 into the column hole 11 and pass a restraint 40 through the fixing hole 12 and the through hole 21 and tighten them. That is, compared with the conventional general connection procedure, the column 20 and the concrete block 10 can be easily and accurately connected.

[0046] The present embodiment is an example, and it goes without saying that it can be modified without departing from the technical idea of the present invention. For example, as shown in Fig. 7, a modification may be made to provide a guardrail 201 in which a pair of guardrail plates 30, 30 are provided facing each other.

Industrial Applicability

[0047] The guardrail according to the present invention can be used as a temporary guardrail or as a guardrail permanently installed on a road. Since such a wide range of usage modes is possible, the industrial applicability is great.

Explanation of Reference Numerals

[0048] 1, 201: Guardrail 10: Concrete block 11: Column hole 12: Fixing hole 13: Upper surface 14: Lower surface 15a, 15b: Side surface 16: Male part side surface 17: Female part side surface 20: Support column 21: Through hole 30: Guard rail plate 40: Restraint device 50: Connector 51: Connecting member 52: Arc-shaped long hole 60: Bracket 61: Guard rail fixing material 62: Support column fixing material 63: Bracket material 64: First connection part 65: Second connection part 70: Male part 71a, 71b: Contact concave part 72: Female part 73a, 73b: Contact convex part L: Longitudinal direction θ: Predetermined angle

Claims

1. A support column, a guardrail plate supported by the support column, a concrete block provided with a support column hole into which the support column can be inserted and removed, and a restraint member that penetrates both the support column and the concrete block to restrain the support column inserted into the support column hole from coming out, wherein the concrete block is provided with a male part side surface defining a male part at one end in the longitudinal direction and a female part side surface defining a female part into which the male part can be inserted at the other end in the longitudinal direction, and the male part side surface and the female part side surface are provided from the upper surface to the lower surface of the concrete block, and a connecting member for connecting the concrete blocks in a state where the male part is inserted into the female part, wherein the connecting member has a connecting member set to a size that covers the upper ends of the male part and the female part, the connecting member is provided with a plurality of arcuate elongated holes defined in an annular shape, and the concrete blocks can rotate along the arcuate elongated holes. A guardrail characterized by this.

2. The support column is provided with a through hole, and the concrete block is provided with a fixing hole connected to the through hole, The restraint member penetrates both the through hole and the fixing hole and is fastened on both side surfaces of the concrete block. The guardrail according to claim 1, characterized by this.

3. The guardrail plate is supported by the support column via a bracket, the bracket has a pair of guardrail fixing members fixed to the guardrail plate, a support column fixing member fixed to the support column, and a pair of bracket members, the bracket member is connected to one end of the guardrail fixing member at a first connection portion and connected to both ends of the support column fixing member at a second connection portion, and the connection length of the first connection portion is shorter than the connection length of the second connection portion. The guardrail according to claim 1 or 2, characterized by this.

4. The male part and the female part are arc-shaped in plan view. The guardrail according to any one of claims 1 to 3, characterized by this.

5. The male part side surface defines a contact recess connected to both side ends of the male part, the female part side surface defines a contact protrusion connected to both side ends of the female part, and when the concrete blocks are at a predetermined angle in a state where the male part is inserted into the female part, the contact recess and the contact protrusion contact each other to restrain the rotation of the concrete blocks. The guardrail according to any one of claims 1 to 4, characterized by this.

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