JP2011246877A - Guardrail - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a low-cost guardrail that composes a wooden beam using a thinning material while securing a sufficient strength.SOLUTION: A guardrail comprises a main beam 1 that is bent so as to form a crest part 13 and valley parts 11 and 12 alternately on both sides and in which a surface 10a with more valley parts appearing than the crest parts is disposed toward the roadway side, a column 2 for supporting the main beam at a proper interval, wooden beams 4 and 5 disposed along the length of a plurality of valley parts that appear on the surface of the main beam toward the roadway side, and a connection member 3 that is included midway between the main beam and the column to connect both the main beam and the wooden beam with the column.

Description

  The present invention relates to a guardrail using a wooden beam.

  Conventionally, wooden guardrails have been proposed in place of steel or concrete guardrails in order to improve the scenery in mountainous areas (see Patent Documents 1 and 2). This type of guardrail is composed entirely of wood by connecting a wooden beam to a wooden support. The technique disclosed in Patent Document 1 is to secure strength by providing a metal core inside a wooden beam and connecting the core to a column with a connection fitting. In the technique disclosed in No. 2, a plate-shaped steel reinforcing plate is connected to a steel support member provided on a support column, and the angle with the support column is adjustable so that the beam can be adjusted according to the curve of the roadway. The angle can be changed.

  However, as described above, when the columns and beams are made of wood, the strength against the collision of the vehicle is often insufficient, and particularly when the wooden member is corroded, the strength at the time of installation is the same. Was not expected to be secured.

  Therefore, as a guard rail having sufficient strength, a plate is formed of a flat steel plate material and a wooden member joined to the roadway side (see Patent Document 3), and a recess is formed in the concave portion of the corrugated steel plate beam. A configuration in which a material is attached (see Patent Document 4) has been proposed.

JP-A-11-280032 JP 2000-73324 A JP 2004-84295 A JP 2006-322269 A

  Since the technique disclosed in Patent Document 3 was developed to provide a guardrail that can be manufactured and installed at low cost, a steel plate material and a wooden member can be integrally attached to a support column. Furthermore, in the case of a steel beam having a general cross-sectional wave shape, it is necessary to replace it in a slight collision, but the above-mentioned replacement is made unnecessary by a buffering effect by a wooden member. To do. Further, the strength of the entire guard rail is supported by the support columns, and the insufficient bending rigidity of the steel plate material is resisted to the load by the axial force between the support columns.

  However, the structure of the guard rail is generally designed based on the theory of weak beam strong beam, and supporting the strength of the entire guard rail with the column is contrary to the above theory. That is, the concept of the weak beam strong beam is to guide the vehicle in contact with the beam intensified and to prevent the vehicle from colliding with the column by reducing the column strength. On the contrary, when the strength of the support is increased, when the vehicle comes into contact with the guardrail, the vehicle will eventually collide with the support and stop, giving a large impact to the vehicle and passengers. It becomes.

  On the other hand, the technique disclosed in Patent Document 4 was developed in order to prevent dust from accumulating in the concave portion of the guard rail having a corrugated cross-section, and considers the landscape while maintaining the intensity of the beam. However, since the decorative material is composed of plywood at one end, it has to be expensive.

  By the way, recently, various uses of thinned wood are being studied. However, because thinned wood is thin compared to large trees, it has low utility value and is currently struggling with processing after thinning. there were. Therefore, it is expected that a wooden beam using thinned wood is also being considered, but as mentioned above, no actual thing has been proposed in terms of strength and cost.

  The present invention has been made in view of the above-mentioned points, and the object of the present invention is to provide a low-cost guardrail in which a wooden beam is configured using thinned wood and sufficient strength is ensured. It is.

  Therefore, the present invention is a main beam that is bent so as to alternately form peaks and valleys on both sides, and the surface where the valleys appear more than the peaks is arranged toward the roadway side, A column that supports the main beam at an appropriate interval, a wooden beam that is disposed along the longitudinal direction of a plurality of valleys that appear on the surface of the main beam that is directed toward the roadway, and the main beam and the column The gist of the present invention is a guardrail that is interposed between the main beam and a connecting member that connects the wooden beam to the column at the same time.

  According to the above configuration, since the main beam is bent so as to alternately form peaks and valleys, the main beam is formed in a cross-sectional wave shape as a whole. At this time, the back surface when the ridge is formed on the front surface (the surface facing the roadway side) is a trough, and conversely, the back surface when the trough is formed on the surface is formed with a ridge. It becomes. Therefore, when the number of bent portions is set to an odd number, the number of peaks and valleys formed on the front or back surface will be different, so the surface where the valleys are formed more than the peaks is the surface. As a result, it is possible to provide a plurality of valleys where wooden beams are to be installed.

  Moreover, a plurality of wooden beams can be confirmed from the roadway side by arranging the wooden beams in the plurality of valley portions on the surface. Furthermore, as described above, the main beam is formed in a wave shape in cross section, so that it can have a stronger structure than a flat beam.

  In the above-mentioned invention, the wooden beam is sawn so as to include at least the center part of the annual ring of wood, and can be a long wooden beam in the direction of the pipe of the wood. According to such a configuration, it is possible to reduce the bending of the wood, increase the range of the used wood, and reduce unnecessary portions generated by the lumbering.

  In this case, it is preferable that the wooden beam has a curved surface portion with an arc-shaped cross section, and the curved surface portion is in contact with the valley surface of the main beam at at least two points. According to such a configuration, positioning is performed by abutting at least two points of the arc-shaped cross section, so that dimensional accuracy is not required when lumber is sawed, and the abutting side with the main beam is not required. Since it can be installed on the main beam by making it a cross-section arc shape, various desired shapes such as an arc shape and a planar shape can be formed on the surface of the wooden beam opposite to the contact side.

  Further, in each of the above inventions, the connecting member may be configured to include a column contact portion that contacts the surface of the column and a beam contact portion that contacts the main beam. According to the above configuration, the column abutting portion can be brought into contact with the surface of the column that is generally cylindrical or columnar, and the beam abutting portion is brought into contact with the main beam having a cross-sectional wave shape. Can be made. Thereby, it becomes possible to support a support | pillar and a main beam with a large area, and can improve support strength.

  On the other hand, the connecting member according to the present invention includes a column-side connecting portion having a column-contacting portion that contacts the surface of the column and a beam-side connecting portion having a beam-contacting portion that contacts the main beam. It can be set as the structure formed by a side connection part and a beam side connection part being connected.

  In the case of the above configuration, the column-side coupling portion can be provided on the column while being in contact with the surface of the cylindrical or column-shaped column, and the beam-side coupling unit is in contact with the back surface of the main beam having a corrugated cross section. Can be coupled to the main beam, so that the coupling between the two can be strengthened. In addition, since both connection parts are further connected, the installation intensity | strength of the main beam with respect to a support | pillar can be improved by strengthening each connection state.

  According to the present invention, the main beam has a corrugated cross-sectional shape in which peaks and valleys are alternately formed, so that sufficient strength against a vehicle collision can be obtained without depending on the strength of the wooden beam. Therefore, even if the strength of the wooden beam is reduced due to corrosion or the like, the strength of the entire guard rail is not reduced. Furthermore, by using a main beam having such an intensity, a guardrail can be provided in accordance with the theory of a weak strut strong beam.

  In addition, the main beam is installed toward the roadway side with the surface where the valleys appear more than the mountain part as the surface. Many wooden beams can be arranged, and the scenery from the roadway side (vehicle) can be improved. That is, when the main beam is made of steel, and when a white paint is applied like a general main beam, a large number of wooden beams are arranged on the surface, so that the surface of the main beam of these configurations Will be covered with the wooden beam, and conversely, the wooden beam will be conspicuous, so that the scenery from the roadway side can be improved. Along with such an improvement of the landscape, a large amount of timber will be used, which will increase the amount of thinned wood used.

  Furthermore, by including an annual ring center part in the wood used for the wooden beam, bending due to drying and moisture absorption of the wood can be reduced. In general, the expansion and contraction rate due to drying and moisture absorption is different between the vicinity of the center of the annual ring and the vicinity of the wood, so when using a part other than the center of the annual ring, it will warp due to the difference in the expansion and contraction rate. By using wood containing the center of the annual ring, the occurrence of the warping can be suppressed.

  Therefore, for example, when wood is used in a log state, the generation of wood scraps scraped off by lumbering is reduced, and the amount of waste generated can be suppressed. In addition, when using thinned wood, relatively small-diameter wood is cut out, so that it is easy to use the thinned wood.

  Further, according to the invention of forming the cross-section arc-shaped portion that contacts at least two places with the valley portion of the main beam, the surface of the thinned material can be used as it is, and the surface on the side that does not contact the main beam has an arbitrary shape Therefore, the surface can be formed in an arc shape or a planar shape. At this time, when processing the surface, it is possible to suppress the warping of the wooden beam by including the center part of the annual ring, as described above, but by making the surface on the side in contact with the main beam into an arc shape, the annual ring This is because the processing including the central portion is simplified. This is because the cross-sectional area is processed relatively large compared to the plate-like material.

It is a disassembled perspective view which shows embodiment of this invention. It is II-II sectional drawing. It is explanatory drawing which shows the relationship between a guardrail and a vehicle. It is explanatory drawing which shows the modification of a wooden beam. It is explanatory drawing which shows the modification of a main beam. It is explanatory drawing which shows other embodiment of a connection member.

  Hereinafter, embodiments of the present invention will be described with reference to the drawings. FIG. 1 shows a first embodiment. As shown in this figure, in the guardrail of the present embodiment, the main beam 1 formed in a corrugated cross section is fixed with a connecting member 3 interposed between the guard 2 and the main beam 1 on the surface side of the main beam 1. Wooden beams 4 and 5 are fixed.

  In the main beam 1, a long plate-shaped member made of steel is bent along a fold line in the longitudinal direction, and valleys 11 and 12 and peaks 13 are alternately formed. Thus, by forming both alternately, the peak part 13 exists in the middle of the valley parts 11 and 12, and the cross-sectional wave shape is formed as a whole. As shown in the figure, the sum of the valleys 11 and 12 and the peaks 13 is an odd number (3 places), and the number of valleys 11 and 12 (2 places) appears more than the number of peaks 13 (1 place). The surface 10a (referred to as the front surface) 10a is arranged with the roadway side facing. That is, if the main beam 1 is observed from the opposite surface (referred to as the back surface) 10b, the valleys 11 and 12 become peaks on the back surface 10b, and the peaks 13 become valleys on the back surface 10b. Then, since the number of mountain parts appears more than the number of valley parts, this surface 10b is not installed facing the roadway side.

  Thus, by determining the surface 10a, the wooden beams 4 and 5 can be installed for the plurality of valleys 11 and 12, respectively, and the ratio of the wooden beams 4 and 5 to the entire surface of the main beam 1 Can be increased. Moreover, by installing the wooden beams 4 and 5 in the valleys 11 and 12, the installation location of the wooden beams 4 and 5 can be clarified and the protruding length of the wooden beams 4 and 5 from the main beam 1 is suppressed. It can be done.

  Such a main beam 1 is supported at both ends by support columns 2. Specifically, the two main beams 1 and 1 adjacent to each other are fixed at the same time in a state where both ends are laminated. Here, since the back surface 10b of the main beam 1 has a wave shape in which two peak portions and one valley portion are formed as described above, this and the cylindrical (or columnar) column 2 are: Since there is no portion that can be directly contacted, or even if it exists, the connecting member 3 is interposed between them.

  The connecting member 3 is configured by bending and bending a plate-like member. A column abutting portion 31 that abuts on the surface of the column 2 is provided at the center, and a valley portion 11 of the main beam 1 is provided on both sides thereof. , 12 are respectively formed with beam abutting portions 32, 33 which abut on the back surface 10b. The column contact portion 31 is formed in a cross-sectional arc shape that matches the curvature of the surface of the column 2, and the beam contact portions 32 and 33 are formed in a planar shape. Further, in the middle of the column contact portion 31 and the beam contact portions 32 and 33, standing portions 34 and 35 that are orthogonal to the contact surfaces of the beam contact portions 32 and 33 are provided. The back surface 10b and the surface of the support column 2 can be installed with a predetermined interval.

  A through hole 31 a is also formed in the support column contact portion 31 of the connecting member 3, and a through bolt 61 can be inserted into the through hole 31. A through hole 21 a is also drilled at an appropriate position of the main body 21 of the column 2 so that the through bolt 61 can also penetrate the column 2. Therefore, by connecting a single through bolt 61 through these through holes 21a and 31a, the two can be connected. In addition, the main beam 1 can also be fastened simultaneously by drilling the same through-hole 13a also in the peak part 13 of the main beam 1. FIG.

  In addition, the through holes 32a, 32a, 33 are positioned at positions where the back surfaces 10b of the valleys 11, 12 of the main beam 1 are in contact with the beam contact parts 32, 33 of the connecting member 3 (positions that match the interval between the valleys 11, 12). 32b, 33a, 33b are drilled, and through-holes 11a, 11b, 12a, 12b are also drilled in the valleys 11, 12 of the main beam 1 facing this, and individual through-bolts 62, 63 are provided in these holes. , 64, 65 are inserted so that the main beam 1 and the connecting member 3 can be connected.

  The wooden beams 4 and 5 mounted on the main beam 1 are exclusively made of thinned wood, and are made by sawing them into logs. Since the thinned wood has a relatively small diameter, it can be cut into a log by cutting the bark a little further after shaving the bark. The wooden beams 4 and 5 are provided with through holes 41 and 51 in the vicinity of both ends, and by inserting through bolts 62 to 65 used when connecting the main beam 1 to the connecting member 2, The troughs 11 and 12 of the main beam 1 can be fixed. Since the wooden beams 4 and 5 are made of logs as described above, the surface of the portion of the main beam 1 that contacts the valleys 11 and 12 is formed in an arc shape in cross section.

  Since the configuration of the present embodiment is as described above, the main beam 1 can be connected to the support column 2 via the connecting member 3, and the wooden beams 4 and 5 can be attached to the main beam 1. This state is shown in FIG.

  As shown in this figure, a connecting member 3 is interposed between the main beam 1 and the support column 2, and a through bolt 61 inserted through the main beam 1 and the connecting member 3 is provided in the support column 2. And is fastened by screwing of a nut 71. The through bolt 61 may be configured to pass through only the connecting member 3 without passing through the main beam 1 and fasten it to the support column 2.

  The wooden beams 4 and 5 are arranged in a state in which the wooden beams 4 and 5 are partially fitted into the valley portions 11 and 12 of the main beam 1, and are fixed by through bolts 62 and 63. In addition to the wooden beams 4 and 5, the through bolts 62 and 63 penetrate the main beam 1 and further penetrate the connecting member 3, and nuts 72 and 73 are screwed on the back side of the connecting member 3. Thus, the three members are fixed integrally. The through bolts 62 and 63 do not reach the column 2. This is because the main body 21 of the column 2 does not exist at the position where the through bolts 62 and 63 are inserted. In addition, the support | pillar 2 is piled up or embed | buried / supported in the ground, and is supported while the lower end is embed | buried under the ground or road surface in the middle of a roadway and a sidewalk, or the road shoulder of a road.

  Here, the contact state of the wooden beams 4 and 5 and the valley portions 11 and 12 of the main beam 1 will be described. As shown in FIG. 2, the wooden beams 4 and 5 are made of logs having a circular cross section. Therefore, the cross section of the wooden beams 4 and 5 is formed on the surfaces of the valley portions 11 and 12 of the main beam 1. The arc-shaped portions 42 and 52 come into contact with each other. When the cross-sectional shapes of the valley portions 11 and 12 of the main beam 1 are also formed in an arc shape, the cross-section arc shape of the wooden beams 4 and 5 can be matched. However, matching the shapes of the troughs 11 and 12 with the shapes of the wooden beams 4 and 5 requires a higher processing accuracy.

  Therefore, as shown in the figure, the valleys 11 and 12 of the main beam 1 have a substantially trapezoidal cross section so that the trapezoidal two hypotenuses 11c, 11d, 12c and 12d have a cross-section arcuate portion 42 of the wooden beams 4 and 5. , 52 come into contact at two points. By such contact at two points, the positions of the wooden beams 4 and 5 are determined. By fastening the wooden beams 4 and 5 thus positioned with the through bolts 62 and 63, the installation state becomes definite.

  In this way, the main beam 1 is supported by the support column 2 via the connecting member 3 to the support column 2 embedded and supported on the road surface or the ground, and the wooden beam 4, When 5 is fixed to the main beam 1, it is supported by the support 2 via the main beam 1 and the connecting member 3.

  By the way, although this support | pillar 2 is equipped with the intensity | strength which can support the main beam 1, the connection member 3, and the wooden beams 4 and 5, the intensity | strength with respect to the lateral external force by the collision of a vehicle is not large. On the other hand, the main beam 1 is made by bending and bending steel in a corrugated cross section, and therefore, the strength against a lateral external force is increased.

  That is, as shown in FIG. 3A, it is assumed that the vehicle CR collides or comes into contact with the guard rail GR provided in a straight line from an oblique direction. At this time, as shown in FIG. 3 (b), after the vehicle CR collides with the guard rail GR, the main beam 1 is curved (elastically deformed or plastically deformed) but has a strength that does not break. On the other hand, the support column 2 is easily tilted or broken to have a weak strength so as not to prevent the main beam 1 from being bent. This is the idea of the weak beam strong beam.

  By reducing the strength of the column 2 in this manner, the vehicle CR that has collided is prevented from stopping in a state of colliding with the column 2. That is, as shown in FIG. 3 (c), the main beam 1 is curved (elastically deformed or plastically deformed) in response to the collision, and guides the direction of the vehicle CR inward. The main beam 1 can be bent in a state where it straddles the plurality of support columns 2 by tilting or breaking the support column 2 and moving the position to the curved main beam 1. As a result, the guard rail GR is curved as a whole without stopping at the column 2, and the direction of the vehicle CR is guided along the curve.

  In the state where the strength of the wooden beams 4 and 5 is lost due to corrosion, the strength of the main beam 1 counteracts the collision of the vehicle as described above. It has sufficient strength. In this case, the wooden beams 4 and 5 supplement the strong beam. However, since it cannot be gently bent, it will be partially broken and broken, but if it is broken at several places, it will be deformed into a broken line and the direction of the vehicle will be deformed.

  Next, modified examples of the wooden beams 4 and 5 will be described. This modification is shown in FIG. 4A is a polygonal part of the cross section, FIG. 4B is a hexagonal cross section, FIG. 4C is a quadrilateral cross section, and FIG. 4D is a substantially semicircular cross section. It is a thing.

  A portion 104 having a polygonal cross section (FIG. 4A) corresponds to the bottom of the valleys 11 and 12 (corresponding to the upper base of the cross-sectional trapezoid) according to the shape of the valleys 11 and 12 of the main beam 1. Flat portions 143 that abut the flat portions 144 and 145 that abut the inclined surfaces of the trough portions 11 and 12 (portions corresponding to the hypotenuses of the trapezoidal cross section) on both sides thereof.

  In addition, the plane part 143 that contacts the bottom surfaces of the valley portions 11 and 12 does not necessarily have to contact the bottom surface. That is, if the flat portions 144 and 145 on both sides can be inclined surfaces of the valley portions 11 and 12, the position of the wooden beam 104 is determined. Moreover, in order to make the plane portions 144 and 145 on both sides come into surface contact with the inclined surfaces of the valley portions 11 and 12, the inclination angles thereof must match, but these angles do not match and partially contact. The wooden beam 104 can be installed even in the state.

  When processing into this shape, it is preferable because surface contact can be made if lumbering can be performed with high accuracy. Further, since the side opposite to the polygonal part has an arcuate cross section, the guardrail to which the wooden beam 104 is attached appears to be arranged with logs processed from the roadway side.

  A hexagonal cross section 204 (FIG. 4B) is obtained by further processing the cross-section arc-shaped portion of the configuration in which the above part is a polygon (FIG. 4A) into a planar shape. The surfaces 243, 244, and 245 with which the valley portions 11 and 12 of the main beam 1 abut are brought into surface contact with the surfaces constituting the valley portions 11 and 12 when processing can be performed with high accuracy as described above. It is something that can be done. And since the cross-sectional shape becomes a square on the opposite side, the guardrail in a state where it is mounted will appear to have square members installed from the roadway side.

  Further, the one having a quadrilateral cross section 304 (FIG. 4C) does not match the shape of the valleys 11 and 12 of the main beam 1, but this is the main beam (valley) of other shapes described later. It is suitable for mounting to a main beam having a quadrilateral cross section.

  Furthermore, in the case of a substantially semicircular section 404 (FIG. 4D), the portion 442 that contacts the valleys 11 and 12 of the main beam 1 has an arcuate section, and each of the valleys 11 and 12 is formed. The surface can be contacted at at least two points. A flat portion 446 is formed on the opposite side, and the flat portion 446 is directed to the surface of the guardrail. Thereby, it seems that the square is arranged from the roadway side.

  Thus, the wooden beams 4 and 5 can be processed into various shapes, the contact state with the main beam 1 can be changed by improving the processing accuracy, and on the surface not in contact with the main beam. Also, it can be processed into a shape that takes into account the landscape from the roadway side. In addition, although the various shapes illustrated here have illustrated the assumed part as a typical example and added the description, they are not limited to these shapes.

  4 (a) to 4 (c) exemplify a wooden beam sawed so as to include the center part of the annual ring, FIG. 4 (d) shows a wooden piece cut at the central part of the annual ring and having a substantially semicircular cross section. The beam is illustrated. The wooden beam sawed so as to include the middle part of the annual ring is less likely to warp due to drying or the like, and can suppress the generation of a gap with the metal main beam, but has a semicircular cross section shown in FIG. When the wooden beam 404 is used, it is preferable that the arcuate section 442 is brought into contact with the main beam 1. The reason for this is that this kind of semi-circular wood has a large contraction on the side of the cross-section arcuate portion 442, so that both ends of the wooden beam 401 can be prevented from floating from the main beam 1.

  Next, a modification of the main beam 1 will be described. The illustrated main beams have different cross-sectional shapes, and the numbers and positional relationships of the valleys 11 and 12 and the peaks 13 are the same as those of the main beam 1 (see FIG. 2) already described. The main beam described here has a trough portion 11, 12 having a substantially semicircular cross-sectional shape (FIG. 5A), a substantially semi-elliptical shape (FIG. 5B), and a quadrilateral (C-shaped). (Fig. 5 (c)) and triangular (V-shaped) (Fig. 5 (d)).

  The reason for the deformation into these shapes is to enable the valleys 11 and 12 to sufficiently support the wooden beams 4 and 5 to be used. The main beams 101 and 201 shown in FIGS. 5 (a) and 5 (b), when the troughs 111 and 112 are substantially semicircular, and the troughs 211 and 212 are substantially semi-elliptical are wooden beams. It can be used in the case where the side contacting the valley portion is a curved surface among the four and five cross-sectional shapes. It is particularly suitable when using wooden beams 4 and 5 made of logs. This is because the range of surface contact increases.

  5C and 5D, when the troughs 311 and 312 have a quadrilateral cross section or the troughs 411 and 412 have a cross-sectional triangle, the wooden beam 4 5 can use what has an angle | corner in cross-sectional shape like a square. The above-described quadrilateral wooden beam (FIG. 4C) is preferably used for the main beams 301 and 401. If the angles forming the respective corners are both 90 degrees, the surfaces on both sides of the corners are in surface contact with the surfaces constituting the valleys 311, 312, 411, 412 of the main beams 301, 401. Because it can be done.

  In addition, it is not an indispensable requirement of the present invention that the valley portion of the main beam and the wooden beam are in surface contact, but when the wooden beam receives an external force (collision, etc.) due to a vehicle or the like due to the contact between the two surfaces. Since the gap with the main beam does not exist or is small, the damage of the wooden beam can be reduced.

  Next, another embodiment of the connecting member 3 will be described. This embodiment is illustrated in FIG. As shown in this figure, the connecting member 103 of this embodiment is composed of two members 203 and 303. In other words, it is composed of a column-side coupling portion 203 having a column abutting portion 231 that abuts on the column 2 and a beam-side coupling portion 303 having beam abutting portions 332 and 333 that abut on the main beam 1.

  Specifically, the strut-side connecting portion 203 bends and curves a belt-shaped metal member, and a strut abutting portion 231 that abuts on the surface of the strut 1 is formed at the center portion. And both sides of this support | pillar contact part 231 are shape | molded by flat form, and the connection surfaces 236 and 237 for connecting with the beam side connection part 203 are comprised. Note that a through hole 231a is formed in the support column contact portion 231, and the support bolt side connecting portion 203 is connected to the support column 2 by inserting a through bolt together with the through hole 21a provided in the main body portion 21 of the support column 2. It can be fixed to.

  On the other hand, the beam side connecting portion 203 is formed by bending a flat metal member, and a concave portion 338 having a width dimension that allows the column side connecting portion 203 to enter is formed at the center thereof. The column-side connecting portion 203 is allowed to enter the recess 338, and the connecting surfaces 236, 238 of the column-side connecting portion 203 are brought into contact with the surface of the recess 338 and fastened with through bolts so as to be integrated. It is. Further, beam contact portions 332 and 333 are disposed on both sides of the concave portion 338, and the beam contact portions 332 and 333 are penetrated while contacting the back surfaces 10 b of the valley portions 11 and 12 of the main beam 1. It is fixed with bolts.

  As mentioned above, although embodiment of this invention was described, it can be set as a various form in the range which does not deviate from the meaning of this invention. For example, although the illustrated trough portions 11 and 12 of the main beam 1 appear at two places on the surface 10a, it is possible to adopt a form using main beams appearing at three places. In this case, another one of the wooden beams 4 and 5 is arranged. And the connection member 3 for fixing the main beam of such a shape to the support | pillar 2 changes the length dimension, increases the number of through-holes, and the number of through-bolts which penetrate each through-hole. Can be dealt with by increasing

1, 101, 201, 301, 401 Main beam 2 Column 3, 103 Connecting member 4, 5, 104, 204, 304, 404 Wooden beam 11, 12 Valley portion 13 Mountain portion 21 Column body 31 Column contact portion 32, 33 Beam contact portion 34, 35 Standing portion 41, 51 Through hole 41, 51, 442 Cross section arc-shaped portion 61, 62, 63, 64, 65 Through bolt CR Vehicle GR Guard rail

Claims (5)

A main beam that is bent so that peaks and troughs are alternately formed on both sides, with the surface where more valleys appear than peaks, and facing the roadway, and this main beam are appropriately spaced A supporting column, a wooden beam disposed along a longitudinal direction of a plurality of valleys appearing on a surface of the main beam directed to the roadway side, and interposed between the main beam and the column, A guardrail comprising a connecting member for connecting a wooden beam to the support column simultaneously with the main beam. The guardrail according to claim 1, wherein the wooden beam is a wooden beam that is lumbered so as to include at least a center part of an annual ring of wood and is long in a direction of a pipe of the wood. The guardrail according to claim 2, wherein the wooden beam has a curved surface portion having an arc shape in cross section, and the curved surface portion is a wooden beam that is in contact with the valley surface of the main beam at at least two points. The guard rail according to any one of claims 1 to 3, wherein the connecting member is a connecting member including a support contact portion that contacts the surface of the support column and a beam contact portion that contacts the main beam. The connection member includes a support column side connection portion having a support column contact portion that contacts the surface of the support column, and a beam side connection portion having a beam contact portion that contacts the main beam. The guardrail according to any one of claims 1 to 3, wherein the guardrail is a connecting member connected to the side connecting portion.

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