Guardrails, joint plates, and construction methods for guardrails

Abstract

To provide a guard fence which, by using wooden beam materials that can be expected to have a certain level of strength, can be constructed with the beam materials temporarily placed and have excellent workability and safety, a joint plate and a guard fence construction method.SOLUTION: In a guard fence 10 which has pillars 1, beam materials 2 installed between the pillars 1, and brackets 3 and joint plates 4 that are attached to the pillars 1 and support the beam materials 2, the joint plate 4 is provided with a support part 41 that receives and supports the beam material 2 and projects toward a roadway side R. Cross laminated timbers (CLT, orthogonal laminated boards) are desirably used in the beam materials 2. The joint plate 4 is provided with a hanging part for hanging onto the bracket 3. The number of stages of the support part 41 is set correspondingly to that of the beam material 2.SELECTED DRAWING: Figure 4

Description

Technical Field

[0001] The present invention belongs to the technical field of protective fences having columns, beam members installed between the columns, brackets and joint plates attached to the columns for supporting the beam members, and more particularly to a protective fence having wooden beam members.

Background Art

[0002] Regarding protective fences installed along the side of a roadway, technologies for protective fences having wooden beams made of thinned wood or the like as part of effective utilization of resources have been disclosed and implemented (see, for example, Patent Documents 1 to 3).

[0003] In Patent Document 1, as shown in FIG. 1 of the same document, there is provided a wooden protective fence 1 including a plurality of columns 2 erected at predetermined intervals on the roadside of the vehicle passage area, and a plurality of wooden beams 5, 6 horizontally installed at predetermined intervals vertically on the front surface of the above-ground part of each column 2, which is configured in a fence shape to receive contact or collision of the vehicle from the front side and conform the behavior of the vehicle to safety standards. The wooden protective fence 1 includes at least two wooden beams 5, 6, a plurality of concrete column above-ground parts provided with a wooden beam attachment part on the road side, a rigid leg 8 provided on the lower surface of the column above-ground part, a pedestal block 18 with a hole buried near the ground surface, and a steel pipe pile 17 buried underground through the hole of the pedestal block 18 and accommodating the leg 8 at the upper part and fixed with mortar 23 (see the description of Claim 1, etc.).

[0004] Patent Document 2 discloses a wooden protective fence 2, as shown in Figure 1 of the same document, which is formed by continuously joining and horizontally installing wooden beams 4 and 5 of a length determined to match the unit span of the support posts 3 on the inside of the above-ground parts of a plurality of support posts 3 erected along the roadside of a road 1, and centering on the joint position of the wooden beams 4 and 5, a joint plate 11 is arranged horizontally with a length greater than 9 to 27% of the length of the wooden beams 4 and 5 and an expansion force of 2 tons or more, and the joint plate 11 and the wooden beams 4 and 5 are connected to each other through mounting holes 13 drilled in the wooden beams 4 and 5 corresponding to the specified value of the joint plate 11, and these are fixed to the support posts 3 (see description of claim 1, etc.).

[0005] Patent Document 3 discloses a wooden guardrail, as shown in Figures 1 and 2 of the same document, comprising a plurality of support columns 2 erected at predetermined intervals and a wooden beam 1 bolted together to span between adjacent support columns 2, wherein the beam 1 is made by stacking fiber-oriented veneers 10 with the fiber direction oriented in the longitudinal direction L of the beam 1 and fiber-orthogonal veneers 11 with the fiber direction oriented substantially perpendicular to the longitudinal direction of the beam 1, with the laminated surface being substantially vertical in the direction H, and the fiber-orthogonal veneers 11 being sandwiched between the fiber-oriented veneers 10 (see description of claim 1, etc.).

[0006] According to the wooden guardrails described in Patent Documents 1 to 3, the beams are made of wood, allowing for the use of thinned timber and other materials as part of the effective utilization of resources, thus enabling the creation of environmentally friendly guardrails. [Prior art documents] [Patent Documents]

[0007] [Patent Document 1] Japanese Patent Publication No. 2002-322622 [Patent Document 2] Japanese Patent Publication No. 2004-27825 [Patent Document 3] Japanese Patent Publication No. 2006-37572 [Overview of the project] [Problems that the invention aims to solve]

[0008] However, the wooden guardrails described in Patent Documents 1 and 2 use natural wood (logs) for the beam material (see paragraphs

[0034] and

[0040] of Document 1, and paragraphs

[0020] and

[0046] of Document 2). Because natural wood is a low-strength material with large variations, it is not only unsuitable for long spans, but in order to ensure the strength of the guardrail, it was necessary to use larger logs or make the material thicker. As a result, the width occupied by the wooden guardrail inevitably becomes thicker, narrowing the road width, and there were issues that needed to be improved. Furthermore, when constructing the protective fence, due to its shape, the beam material could not be temporarily placed during construction. It was necessary to suspend and support the beam material until it was fixed to the support posts with bolts, which presented challenges in terms of safety and ease of construction that needed improvement.

[0009] The wooden guardrail described in Patent Document 3 uses laminated timber with improved strength due to modifications made to the wooden beam material. Compared to Patent Documents 1 and 2, it allows for longer spans and reduces the width occupied by the wooden guardrail to some extent. However, similar to Patent Documents 1 and 2, the beam material cannot be temporarily installed, and issues regarding safety and ease of construction remain.

[0010] Therefore, the present invention was devised in view of the problems of the background technology described above, and its objective is to provide a protective fence, joint plates, and a method for constructing a protective fence that are excellent in constructability and safety, and that can be constructed by temporarily placing wooden beams that can be expected to have a certain strength. [Means for solving the problem]

[0011] As a means to solve the above problems, the protective fence according to the invention described in claim 1 is a protective fence having posts, beam members erected between posts, and brackets and joint plates attached to the posts to support the beam members, The joint plate is formed by a support portion that protrudes toward the roadway and a rear portion that extends vertically upward from the rear end of the support portion, and the upper end of the rear portion is provided with a hooking portion for hooking onto the upper end of the bracket from above, and The bottom of the beam material can be temporarily placed on the support portion, and the beam material can be positioned with the front and top portions of the beam material exposed. Fittings Fixed to the plate, The joint plate has loose holes formed therein that allow for the tightening and loosening of bolts used to fix the bracket to the support column. It is characterized by the following.

[0012] The protective fence described in claim 2 is the protective fence described in claim 1, wherein the beam material is cross-laminated timber - Laminated timber, laminated veneer Material, Alternatively, it is characterized by being made of plywood.

[0014] The protective fence described in claim 3 is characterized in that, in the protective fence described in claim 1 or 2, the projection dimension of the support portion toward the roadway is set to be half or more of the width dimension of the beam material in the roadway direction.

[0015] The protective fence described in claim 4 is a combination of claims 1 to 3 A protective fence as described in any one of the above paragraphs, characterized in that the support portion is provided with a recess or a protrusion, and the beam material is provided with a protrusion or recess that fits into the recess or protrusion.

[0016] Claim 5 The protective fence described in Claims 1 to 4 In a protective fence described in any one of the above items, the support portion is characterized in that the number of stages is the same as the number of stages of the beam material. Claim 6 The protective fence described in Claims 1 to 4In the protective fence according to any one of the preceding claims, the brackets and the joint plates are set to the same number of steps as the number of steps of the beam material.

[0017] Claim 7 The construction method of the protective fence according to the invention described in the claim is the joint plate of the protective fence having a support, a beam material installed between the supports, and brackets and joint plates attached to the supports to support the beam material, formed by a support portion protruding toward the roadway side and a back portion extending vertically upward from the rear end portion of the support portion, and a latching portion for latching the upper end portion of the bracket from above is provided at the upper end portion of the back portion, and it is possible to temporarily place the bottom portion of the beam material on the support portion, and the beam material is fixed in a state where the front portion and the upper portion of the beam material are exposed The bracket is provided with a loose hole that allows for tightening and loosening of bolts for fixing the bracket to the support column. and characterized by that.

[0018] Claim 8 The construction method of the protective fence according to the invention described in the claim is a method of constructing the protective fence according to any one of claims 1 to 6 and characterized by comprising a step of temporarily placing the beam material on the support portion provided on the joint plate, and then bolt-joining and integrating the beam material to the bracket via the joint plate. The aforementioned

Advantages of the Invention

[0019] According to the protective fence, the joint plate, and the construction method of the protective fence according to the present invention, the following effects can be obtained. Since it is configured to be implemented using a wooden beam material capable of achieving a certain strength, it has higher strength and less variation compared to the beam material of natural wood according to the prior art, and thus can also cope with long spans. Therefore, it is possible to realize a protective fence, a joint plate, and a construction method of a protective fence that are excellent in workability, economy, and quality. ​​Furthermore, since the beam material can be temporarily placed in a stable position on the support portion formed in the joint plate, workers can install it smoothly in a comfortable posture without having to lift or support it. Thus, it is possible to realize a protective fence, joint plate, and protective fence construction method that are excellent in terms of constructability and safety. [Brief explanation of the drawing]

[0020] [Figure 1] A is a front view showing the protective fence according to the present invention (Example 1), B is a top view thereof, and C is a right side view thereof. [Figure 2] This is an enlarged view of the main part of Figure 1A. [Figure 3] This is an enlarged view of the main part of Figure 1B. [Figure 4] This is an enlarged view of the main part of Figure 1C. [Figure 5] This is an explanatory diagram showing a breakdown of Figure 3. [Figure 6] This is an explanatory diagram showing an exploded view of Figure 4. [Figure 7] A is a front view showing the beam material used in the protective fence shown in Figure 1, B is a top view of the same, and C is a right side view of the same. [Figure 8] A is a front view showing the bracket used in the protective fence shown in Figure 1, and B is a plan view of the same. [Figure 9] A is a front view showing a joint plate used in the protective fence shown in Figure 1, B is a top view of the same, and C is a right side view of the same. [Figure 10] This is a right side view showing variations of the aforementioned joint plate. [Figure 11] A is a front view showing the protective fence according to the present invention (Example 2), B is a top view thereof, and C is a right side view thereof. [Figure 12] This is an enlarged view of the main part of Figure 11A. [Figure 13] This is an enlarged view of the main part of Figure 11B. [Figure 14] This is an enlarged view of the main part of Figure 11C. [Figure 15]This is an explanatory diagram showing a breakdown of Figure 13. [Figure 16] This is an explanatory diagram showing an exploded view of Figure 14. [Figure 17] A is a front view showing the beam material used in the protective fence shown in Figure 11, B is a top view of the same, and C is a right side view of the same. [Figure 18] A is a front view showing the bracket used in the protective fence shown in Figure 11, and B is a plan view of the same. [Figure 19] A is a front view showing a joint plate used in the protective fence shown in Figure 11, B is a top view of the same, and C is a right side view of the same. [Figure 20] This is a right side view showing variations of the aforementioned joint plate. [Modes for carrying out the invention]

[0021] Next, embodiments of the protective fence, joint plate, and construction method for the protective fence according to the present invention will be described based on the drawings. [Examples]

[0022] The protective fence 10 according to the present invention (Example 1), as shown in Figures 1 to 9, comprises a support column 1, a beam member 2 installed between the support columns 1, and a bracket 3 and a joint plate 4 attached to the support columns 1 to support the beam member 2. The joint plate 4 is provided with a support portion 41 that receives and supports the beam member 2, protruding toward the roadway side R.

[0023] As an example, the aforementioned support column 1 is made of a hollow round steel pipe (φ114.3 × 4.5 mm) with a height of approximately 2175 mm, and a cover material 11 is attached to the top. Multiple columns (three in the drawing for illustrative purposes) are erected at intervals of approximately 2000 mm in the direction of the extension of the roadway. The material, form (shape, size), installation location, number of installations, and installation interval of the support column 1 are not limited to those stated above and can be appropriately modified according to the structural design. Furthermore, the support column 1 is erected, for example, by embedding its lower portion (approximately 1400 mm in height) into the ground 9. If necessary, it can also be constructed to rise from a concrete foundation embedded in the ground 9. Furthermore, the support column 1 is provided with bolt holes (round holes) 12 for attaching the bracket 3, in a direction substantially perpendicular to the direction of roadway extension. After erecting the required number of support columns 1 as described above, the bracket 3 is attached to the roadway side R of the erected support columns 1.

[0024] The beam material 2 is preferably made of cross-laminated timber (CLT), laminated timber, laminated veneer lumber (LVL), or plywood. In this embodiment, cross-laminated timber (CLT) 2 is used as an example (hereinafter referred to as CLT). CLT is an abbreviation of the English term Cross Laminated Timber, and refers to a wood-based material made by arranging sawn boards (laminas) and then laminating and bonding them so that the fiber directions are perpendicular to each other. The beam material 2 formed from the aforementioned CLT is, for example, formed in the shape of a horizontally elongated rectangular parallelepiped with a height of approximately 350 mm, a width of approximately 90 mm, and a length of approximately 1990 mm, and is continuously erected along the direction of the roadway extension. There are various methods for erecting the beam member 2 onto the support column 1, but in this embodiment, it is erected via brackets 3 and joint plates 4 that are sequentially attached to the roadway side R of the support column 1. For this reason, bolt holes 21 are drilled at both ends of the beam member 2, both above and below, for fastening together with the brackets 3 and joint plates 4 attached to the support column 1. In this embodiment, the bolt holes 21 are formed in a stepped shape that can accommodate the heads of the bolts 8, as can be clearly seen in Figures 5 and 6. The form (shape, size) of the beam material 2 is, of course, not limited to the above, and can be appropriately modified according to the structural design. For example, in this embodiment, a single beam material 2 that is tall (about 350 mm) is used, but it is not limited to this, and it can also be implemented in a multi-stage type (a configuration in which multiple beam materials are arranged in parallel) with two, three, or other shorter beam materials. When implementing the multi-stage type, for example, as shown by the dashed line in Figure 9C, the number of stages of the support portion 41 protruding from the joint plate 4 can be set (added) to match the number of stages (the same number), or, as illustrated in Embodiment 2 (Figures 11 to 19) described later, a shorter bracket 3' and joint plate 4' can be used to set the number of stages to match the number of stages of the beam material 2' (two stages in the illustrated example), and such measures can be taken as appropriate.

[0025] As can be clearly seen in Figure 8, the bracket 3 is formed in a roughly hat shape with an equal cross-section, consisting of a rear flange portion 31, a pair of web portions 32 that bend forward from both ends of the rear flange 31, and a pair of front flange portions 33 that bend outward from the front ends of the web portions 32. In this embodiment, the bracket 3 is typically made with a height of approximately 270 mm and a width of approximately 300 mm (see Figure 8A). It is also made with a plate thickness of approximately 6 mm, a rear flange portion 31 width (internal dimension) of approximately 100 mm, a pair of web portions 32 lengths of approximately 35 mm each, and a pair of front flange portions 33 widths of approximately 100 mm each (see Figure 8B). The rear flange 31 has one bolt hole 31a drilled in its center for attachment to the support column 1. The bolt hole 31a is formed as a horizontally elongated loose hole (22 x 50 mm). In addition, the left and right front flange portions 33 each have a total of four bolt holes 33a drilled at the top, bottom, left, and right corners for attaching and supporting the beam material 2. The bolt holes 33a are formed as horizontally elongated loose holes (24 x 40 mm). Then, the bracket 3 fixed to the support column 1 is positioned so that the ends of adjacent beam members 2 are brought together at approximately the center, and the two bolt holes 33a provided on each side are configured to correspond to adjacent beam members 2.

[0026] The joint plate 4 is rectangular in shape when viewed from the front, and has a hook 42 at its upper end for attaching to the bracket 3 from above, and a support 41 at its lower end that protrudes toward the roadway R for receiving and supporting the beam material 2. The purpose of providing this joint plate 4 is to achieve good vehicle guidance by firmly integrating each beam material 2 through this joint plate 4, thereby preventing the colliding vehicle from coming to a sudden stop. In this embodiment, the joint plate 4 is, for example, made with a uniform cross-sectional shape having a height of approximately 311 mm, which is longer than the bracket 3, a width of approximately 300 mm, which is the same as the bracket 3, a protrusion dimension of the support portion 41 of approximately 84 mm, and a thickness of approximately 4 mm. Incidentally, the rectangular body of the joint plate 4 has one horizontally elongated loose hole 4b (24 x 80 mm) drilled in its center, where its core roughly coincides with the loose hole 31a of the bracket 3. In addition, horizontally elongated loose holes 4a (24 x 30 mm) are drilled in the four corners, top, bottom, left, and right, where their cores roughly coincide with the loose holes 33a of the bracket 3. Furthermore, the loose hole 4b provided in the center of the joint plate 4 is formed so that even after the joint plate 4 is attached to the bracket 3, the head of the bolt 7 used to fix the bracket 3 to the support column can be held with a wrench. This allows the bolt 7 and nut 17 to be fully tightened after the joint plate 4 is attached, and can also be used during maintenance. In this embodiment, the fastening portion 42 is provided in two balanced locations at the left and right ends, but it is not limited to this configuration. The design can be modified as appropriate as long as it allows for stable fastening to the bracket 3. In this embodiment, the support portion 41 is configured to protrude substantially horizontally (by bending in this embodiment) from the lower end of the joint plate 4 toward the roadway R, but it is not limited to this configuration, and the design can be modified as appropriate as long as it can stably receive and support the beam material 2. For example, when the lower end of the beam material 2 is made with a rounded semicircular cross section, or when the beam material 2 itself is made with a circular cross section, the joint plate 4 can be made with a joint plate 14 having a J-shaped support portion 43, as shown in Figure 10, and other such modifications can be made as appropriate. However, when the support portion 41 is implemented in a shape that protrudes substantially horizontally, as in this embodiment, it is preferable to set the protrusion dimension (approximately 84 mm in this embodiment) to be more than half of the width dimension of the beam material 2 (approximately 90 mm in this embodiment).

[0027] Next, a construction method for building a protective fence 10 using the above-described support columns 1, beam members 2, brackets 3, and joint plates 4 will be explained.

[0028] In this embodiment, the protective fence 10 is first installed on a predetermined ground 9 with the support posts 1 fitted with cover material 11, according to the installation interval (approximately 2000 mm in this embodiment as an example) and number of posts to be installed, which are derived from the installation area to be installed on the side of the road, etc. In this embodiment, the support posts 1 are erected with the lower end portion of approximately 1400 mm of the height of approximately 2175 mm embedded in the ground 9, and approximately 775 mm protruding above the ground.

[0029] Next, the rear flange portion 31 of the bracket 3 is placed against the roadway side R of the erected support column 1, and alignment is performed such as aligning the bolt holes 12 of the support column 1 with the bolt holes 31a of the rear flange portion 31. Headed bolts 7 are passed through the aligned bolt holes 12 and 31a from the roadway side R and fastened with nuts 17, thereby attaching the bracket 3 to the roadway side R of the support column 1.

[0030] Next, the fastening portion 42 of the joint plate 4 is hooked onto the upper end of the bracket 3 and fastened, and the four bolt holes 33a of the front flange 33 of the bracket 3 and the four bolt holes 4a of the joint plate 4 are aligned.

[0031] Next, with the joint plate 4 still attached to the bracket 3, the beam members 2 are temporarily placed with their ends butted together at approximately the center of the support portion 41 of the joint plate 4. Then, while the beam members are still temporarily placed, the bolt holes 33a and 4a are aligned with the corresponding bolt holes 21 of the adjacent beam members 2. The worker performing the alignment does not need to support the beam members 2, so they can perform the alignment work smoothly in a comfortable posture. Subsequently, headed bolts 8 are passed through the four bolt holes 33a, 4a, and 21, which have been aligned, from the roadway side R and fastened with nuts 18. The joint plate 4 and beam material 2 are then attached to the bracket 3, which is attached to the roadway side R of the support column 1, to integrate them. The bolt holes 21 through which the headed bolts 8 pass are formed in a stepped shape that accommodates the head of the bolt 8, so that the bolt 8 (head) does not protrude from the surface of the beam material 2. This process is repeated according to the number of support columns 1 (brackets 3) to construct the guardrail 10 along the direction of the roadway extension.

[0032] In this embodiment, the two adjacent beam members 2 are installed simultaneously, but this is by no means the only method; the beam members 2 can also be installed sequentially one at a time. [Examples]

[0033] Figures 11 to 19 show the protective fence, joint plates, and construction method for the protective fence according to Example 2. This embodiment 2 differs from embodiment 1 in that the beam material 2 is made of a low-profile, two-tiered beam material 2', and accordingly, the bracket 3 and joint plate 4 are made of a low-profile, two-tiered bracket 3' and joint plate 4' that match the shape (number of tiers) of the beam material 2'.

[0034] In other words, the guardrail 10' according to Embodiment 2, as shown in Figures 11 to 19, has a support column 1', two beam members 2' arranged in an upper and lower two-tier configuration and installed between the support columns 1', and a pair of brackets 3' and a pair of joint plates 4' attached to the support columns 1' to support the beam members 2', with each of the pair of joint plates 4' having a support portion 41' that protrudes toward the roadway side R to receive and support the beam members 2'.

[0035] As an example, the aforementioned support column 1' is made of a hollow round steel pipe (φ114.3 × 4.5 mm) with a height of approximately 2175 mm, and a cover material 11' is attached to the top. Multiple columns (three in the drawing for illustrative purposes) are erected at intervals of approximately 2000 mm in the direction of the extension of the roadway. The material, form (shape, size), installation location, number of installations, and installation interval of the support column 1' are, of course, not limited to those stated above, and can be appropriately modified according to the structural design. Furthermore, the support column 1' is erected, for example, by embedding its lower portion (approximately 1400 mm in height) into the ground 9. If necessary, it can also be constructed to rise from a concrete foundation embedded in the ground 9. Furthermore, the support column 1' has two bolt holes (round holes) 12' for attaching the pair of brackets 3', located vertically and horizontally in a direction approximately perpendicular to the extension of the roadway. After erecting the required number of support columns 1' as described above, the bracket 3' is attached to the roadway side R of the erected support columns 1'.

[0036] The beam material 2' is preferably made of cross-laminated timber (CLT), laminated timber, veneer laminated lumber (LVL), or plywood. In this embodiment, as an example, cross-laminated timber (CLT) 2' is used, similar to Example 1 above (hereinafter referred to as CLT). The beam material 2' formed from the aforementioned CLT is, for example, formed in the shape of a horizontally elongated rectangular parallelepiped with a height of approximately 150 mm, a width of approximately 90 mm, and a length of approximately 1990 mm, and is continuously erected along the direction of the roadway extension. There are various methods for erecting the beam member 2' onto the support column 1', but in this embodiment, it is erected via brackets 3' and joint plates 4' that are sequentially attached to the roadway side R of the support column 1'. For this reason, bolt holes 21' are drilled at both ends of the beam member 2' for fastening together with the brackets 3' and joint plates 4' attached to the support column 1'. In this embodiment, the bolt holes 21' are formed in a stepped shape that can accommodate the head of the bolt 8', as can be clearly seen in Figures 15 and 16. The form (shape, size) of the beam material 2' is, of course, not limited to the above, and can be appropriately modified according to the structural design.

[0037] As can be clearly seen in Figure 18, the bracket 3' is formed in a roughly hat shape with an equal cross-section, consisting of a rear flange portion 31', a pair of web portions 32' that bend forward from both ends of the rear flange 31', and a pair of front flange portions 33' that bend outward from the front end of the web portions 32'. In this embodiment, the bracket 3' is typically made with a height of approximately 70 mm and a width of approximately 300 mm (see Figure 18A). It is also made with a plate thickness of approximately 4.5 mm, a rear flange portion 31' width (internal dimension) of approximately 100 mm, a pair of web portions 32' lengths of approximately 31 mm each, and a pair of front flange portions 33' widths of approximately 100 mm each (see Figure 8B). The rear flange 31' has one bolt hole 31a' drilled in its center for attachment to the support column 1'. The bolt hole 31a' is formed as a horizontally elongated loose hole (22 x 50 mm). In addition, the left and right front flange portions 33' each have bolt holes 33a' drilled for attaching and supporting the beam material 2'. The bolt holes 33a' are formed as horizontally elongated loose holes (22 x 28 mm). Then, the bracket 3' fixed to the support column 1' is positioned so that the ends of adjacent beam members 2' are brought together at approximately the center, thereby ensuring that the bolt holes 33a' provided on the left and right correspond to the adjacent beam members 2'.

[0038] The joint plate 4' is a horizontally elongated rectangle when viewed from the front, and has a hook portion 42' at its upper end for attaching to the bracket 3' from above, and a support portion 41' at its lower end that protrudes toward the roadway side R for receiving and supporting the beam material 2'. The purpose of providing this joint plate 4' is to achieve good vehicle guidance by firmly integrating each beam material 2' through this joint plate 4', thereby preventing the colliding vehicle from coming to a sudden stop. In this embodiment, the joint plate 4' is, for example, made with a uniform cross-sectional shape having a height of approximately 111 mm, which is longer than the bracket 3', a width of approximately 300 mm, which is the same as the bracket 3', a protrusion dimension of the support portion 41' of approximately 84 mm, and a thickness of approximately 4 mm. Incidentally, the rectangular body of the joint plate 4' has horizontally elongated loose holes 4a' (24 x 30 mm) drilled in the upper left and right corners, where their centers roughly coincide with the loose holes 33a' of the bracket 3'. In this embodiment, the fastening portion 42' is provided in two balanced locations at the left and right ends, but it is not limited to this configuration. The design can be modified as appropriate as long as it allows for stable fastening to the bracket 3'. In this embodiment, the support portion 41' is configured to protrude substantially horizontally (by bending in this embodiment) from the lower end of the joint plate 4' toward the roadway R, but it is not limited to this configuration, and the design can be modified as appropriate as long as it can stably receive and support the beam material 2'. For example, when the lower end of the beam material 2' is made with a rounded semicircular cross-section, or when the beam material 2' itself is made with a circular cross-section, the joint plate 4' can be made with a joint plate 14' having a J-shaped support portion 43' as shown in Figure 20, and other such modifications can be made as appropriate. However, when the support portion 41' is implemented in a shape that protrudes substantially horizontally, as in this embodiment, it is preferable to set the protrusion dimension (approximately 84 mm in this embodiment) to be more than half of the width dimension of the beam material 2' (approximately 90 mm in this embodiment).

[0039] Next, a construction method for building a protective fence 10' using the above-described configuration of support columns 1', beam members 2', brackets 3', and joint plates 4' will be explained.

[0040] In this embodiment, the protective fence 10' is first installed on a predetermined ground 9 with the support posts 1' fitted with cover material 11' according to the installation interval (approximately 2000 mm in this embodiment as an example) and number of posts to be installed, which are derived from the installation area to be installed on the side of the road, etc. In this embodiment 2, similar to the embodiment 1, the support posts 1' are erected with the lower end approximately 1400 mm of the approximately 2175 mm height embedded in the ground 9, and approximately 775 mm protruding above the ground.

[0041] Next, the rear flange portion 31' of the bracket 3' is placed against the roadway side R of the erected support column 1', and alignment is performed such as aligning the bolt holes 12' of the support column 1' with the bolt holes 31a' of the rear flange portion 31'. Headed bolts 7' are passed through the aligned bolt holes 12' and 31a' from the roadway side R and fastened with nuts 17', thereby attaching a pair of brackets 3' to the roadway side R of the support column 1' in an upper and lower two-tier configuration.

[0042] Next, the fastening portions 42' of the pair of joint plates 4' are hooked onto the upper ends of the pair of brackets 3', and alignment is performed such as aligning the two bolt holes 33a' on the left and right of the front flange 33' of the bracket 3' with the two bolt holes 4a' on the left and right of the joint plate 4'.

[0043] Next, with the pair of joint plates 4' still attached to the pair of brackets 3', the beam members 2' are temporarily placed with their ends butted together at approximately the center of the support portion 41' of the joint plate 4'. Then, while the beam members are still temporarily placed, the bolt holes 33a' and 4a' are aligned with the corresponding bolt holes 21 of the adjacent beam members 2'. The worker performing the alignment does not need to support the beam members 2', so they can perform the alignment work smoothly in a comfortable posture. Subsequently, headed bolts 8' are passed through the aligned bolt holes 33a', 4a', and 21' from the roadway side R and fastened with nuts 18'. The joint plate 4' and beam material 2' are then attached to the bracket 3' attached to the roadway side R of the support column 1' to integrate them. The bolt holes 21' through which the headed bolts 8' pass are formed in a stepped shape to accommodate the head of the bolt 8', so that the bolt 8' (head) does not protrude from the surface of the beam material 2'. This process is repeated according to the number of support columns 1' (brackets 3') to construct the protective fence 10' along the roadway extension direction.

[0044] In this embodiment, the two adjacent beam members 2' are installed simultaneously, but this is by no means the only method; the beam members 2' can also be installed sequentially, one at a time.

[0045] Although embodiments have been described above based on the drawings, it should be noted that the present invention is not limited to the illustrated examples and includes design modifications and variations in application that are commonly performed by those skilled in the art, without departing from the technical idea. For example, although not shown in the diagram, the joint plate 4 (or 4') can be configured to have recesses or protrusions on the support portion 41 (or 41'), and to have protrusions or recesses on both ends (or one end or the center, etc.) of the beam material 2' that fit into the recesses or protrusions, thereby enhancing the positioning function and fall prevention function of the beam material 2 (or 2') temporarily placed on the support portion 41 (or 41'). [Explanation of Symbols]

[0046] 1 post 11 Lid material 12 bolt holes 2 Beam material 21 bolt holes 3 brackets 31 Rear flange 31a Bolt holes 32 Web 33 Front flange 33a Bolt holes 4. Fitting plate 4a Bolt holes 4b Through hole 41 Support Department 43 Support Department 42. Hook 7 volts 8 volts 9 Ground (ground) 10 Protective fence 14 Fitting Plate 17 Nuts 18 nuts R road side 1' post 11' Lid material 12" bolt holes 2' Beam material 21' Bolt holes 3' bracket 31' Rear flange 31a' Bolt holes 32' Web 33' Front flange 33a' Bolt holes 4' Fitting Plate 4a' Bolt holes 4b' Through hole 41' Support Department 43' Support Department 42' Hook 7' Bolt 8' Bolt 10' protective fence 14' Fitting Plate 17' Nut 18' Nut

Claims

1. A protective fence comprising support columns, beam members erected between the support columns, and brackets and joint plates attached to the support columns to support the beam members, The joint plate is formed by a support portion that protrudes toward the roadway and a rear portion that extends vertically upward from the rear end of the support portion, and the upper end of the rear portion is provided with a hooking portion for hooking onto the upper end of the bracket from above, and A protective fence characterized in that the bottom of the beam material can be temporarily placed on the support portion, the beam material is fixed to the joint plate with the front and upper portions of the beam material exposed, and the joint plate has loose holes formed therein that allow tightening and loosening of bolts for fixing the bracket to the support column.

2. The protective fence according to claim 1, characterized in that the beam material is made of cross-laminated timber, glued laminated timber, laminated veneer timber, or plywood.

3. The protective fence according to claim 1 or 2, characterized in that the projection dimension of the support portion toward the roadway is set to be half or more of the width dimension of the beam material in the roadway direction.

4. A protective fence according to any one of claims 1 to 3, characterized in that the support portion is provided with a recess or a protrusion, and the beam material is provided with a protrusion or recess that fits into the recess or protrusion.

5. The protective fence according to any one of claims 1 to 4, characterized in that the support section is set to the same number of stages as the number of stages of the beam material.

6. The protective fence according to any one of claims 1 to 4, characterized in that the bracket and the joint plate are set to the same number of rows as the number of rows of the beam material.

7. A joint plate for a protective fence having support columns, beam members erected between the support columns, and brackets and joint plates attached to the support columns to support the beam members, It is formed by a support portion that protrudes toward the roadway and a rear portion that extends vertically upward from the rear end of the support portion, and the upper end of the rear portion is provided with a fastening portion for fastening to the upper end of the bracket from above, and A joint plate characterized in that the bottom of the beam material can be temporarily placed on the support portion, the beam material is fixed with the front and upper portions of the beam material exposed, and loose holes are formed that allow tightening and loosening of bolts for fixing the bracket to the support column.

8. A method for constructing a protective fence according to any one of claims 1 to 6, A method for constructing a protective fence, characterized by the step of temporarily placing the beam material on a support portion provided on the joint plate, and then bolting the beam material to the bracket via the joint plate to integrate it.

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