JP2005054539A - Handrail - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a handrail hardly generating noise as the metallic handrail installed in an outdoor part. <P>SOLUTION: A plurality of muntins 4A consisting of metal hollow extrusion moldings provided with screw holes 4a continued between upper and lower metal horizontal muntins 2 and 3 in the inside in a longitudinal direction are connected with screws by being spaced at prescribed intervals by butting upper and lower end faces on the horizontal muntins 2 and 3. A suppression frame 6A provided with a plurality of fitting parts 61 fitted tightly over 50 % or larger of the perimeter of the muntin in the neighborhood of the end of each muntin 4A is arranged in parallel to the horizontal muntins 2 and 3. <P>COPYRIGHT: (C)2005,JPO&NCIPI

Description

  The present invention is a handrail having a structure in which a plurality of vertical rails are connected at predetermined intervals between upper and lower horizontal rails, and in particular, the horizontal rails and vertical rails are made of metal such as an aluminum extrusion mold material and are erected on an outdoor portion. Regarding handrails.

  As a typical form of handrails erected on the rooftops, verandas, passageways facing outside, roadsides, etc., the upper and lower horizontal rails are installed between the columns erected on the concrete frame etc. In some cases, a plurality of vertical bars are arranged at predetermined intervals between the upper and lower horizontal bars. Note that the upper horizontal beam connecting the upper ends of the vertical beam may be a headboard or a horizontal rail disposed below the headboard. Thus, in such a handrail, from the viewpoint of material cost, assembly workability, durability, etc., each component member is constituted by an aluminum extrusion mold material, and a vertical beam is used as a vertical rail. A structure in which the upper and lower ends of the vertical beam are fixed to the upper and lower horizontal beams using screw holes provided on the inside is widely used.

  9 to 11 show one configuration example of the handrail having the above structure. In the figure, reference numeral 11 denotes a pair of left and right square cylindrical pillars having screw holes 11a continuous in the longitudinal direction at the inner four corners, and 12 denotes a headboard body 12a having an open U-shape with a longitudinal section facing downward and a headboard holder engaged with its lower surface. 12b, 13 is a lower horizontal beam comprising a U-frame-shaped horizontal beam main body 13a opened downward and a bottom plate 13b engaged with the lower surface thereof, and 14 is continuous in the longitudinal direction at two locations inside. It is a rectangular tube-shaped vertical cross provided with screw holes 14a.

  In this handrail, the support column 11 and the headboard 12 are connected by screwing screws 15. Further, the column 11 and the lower horizontal rail 13 are cut in the longitudinal direction at the same position from the end of the horizontal beam main body 13a into a plurality of ridges 16 integrally formed on the inner surfaces of both side walls of the horizontal beam main body 13a. The receiving plate 17 inserted into the cut portion and the side wall portion 11 b of the supporting column 11 are attracted and fixed by tightening bolts and nuts 18. On the other hand, the vertical beam 14 is screwed into the screw hole 14a by inserting two screws 15 penetrating the upper wall portion of the lower cross beam 13 from the lower side on the upper end side from above and the lower wall 13 from the lower side on the lower end side. The headboard receiver 12b and the lower horizontal rail 13 are connected and fixed.

  However, handrails erected on this type of outdoor part are generally prone to annoying noises with metal sounds when subjected to wind, and are frequently 3-8 m / sec. In particular, there is a problem that the living environment in the vicinity deteriorates because the noise level tends to be very high in a wind speed range that cannot be said to be a strong wind.

  In view of the above-mentioned circumstances, the inventors of the present invention first conducted a detailed blow experiment on the mechanism of noise generation in this type of conventional handrail in order to develop a handrail that hardly generates noise. As a result, when the wind passes between the vertical beams, an excessive vortex is generated, which causes the vertical beam to bend and vibrate, and the screw stoppers at the upper and lower ends of the vertical beam fluctuate. On the other hand, the material hits the side rail repeatedly and generates intermittent noise, and the noise resonates due to the natural frequency of the handrail, especially in the range of 3 to 8 m / sec. It was found that the phenomenon significantly increased. Therefore, further investigation was made based on this knowledge, and when a restraining frame that closely fits the peripheral surface in the vicinity of the end of the vertical beam was provided, due to the vibration damping effect and the fixing effect due to the restraint of the vertical beam end The present inventors have found that noise can be remarkably reduced and have made the present invention.

  That is, the handrail according to the invention of claim 1 is continuous in the longitudinal direction on the inner side between the upper and lower metal horizontal rails (headboard 2, lower horizontal rail 3) if shown with reference numerals in the drawings. A plurality of vertical beams 4A to 4C made of a metal hollow extrusion mold material provided with screw holes 4a are connected to screws 5 which are screwed into the screw holes 4a from the side of the horizontal beams 2 and 3, with the upper and lower end surfaces being abutted against the horizontal beams 2 and 3. Are connected at predetermined intervals, and are fitted to at least one side of the upper and lower horizontal rails 2 and 3 in close proximity to the end of each vertical rail 4 over 50% or more of the circumferential length of the vertical rail. The holding frames 6 </ b> A to 6 </ b> D having 63 are arranged in parallel with the horizontal rails 2 and 3.

  In the invention of claim 2, the holding frames 6A to 6D in the handrail of claim 1 are composed of a horizontal wall portion 6a provided with the fitting portions 61 to 63 at predetermined intervals, and a vertical wall portion 6b. It is assumed to have an L-shaped longitudinal section. According to a third aspect of the present invention, the fitting portions 61 and 62 of the holding frames 6A, 6B, and 6D in the handrail of the second aspect are formed in a notch shape that opens at the side edge of the horizontal wall portion 6a. The vertical bars 4A and 4B have a shape that can be fitted in the horizontal direction.

  Furthermore, in the handrail according to any one of the first to third aspects, in the invention according to the fourth aspect, the holding frames 6A to 6C are integrally formed on the horizontal rails 2 and 3, A structure in which the holding frame 6D is screwed to the horizontal rails 2 and 3 is employed.

  According to a sixth aspect of the present invention, in any of the handrails of the first to fifth aspects, the holding frame 6E has a substantially F-shaped longitudinal section composed of two upper and lower horizontal wall portions 6a and 6c and a vertical wall portion 6b. It is configured.

  The invention of claim 7 is the handrail of any one of claims 1 to 6, wherein the fitting portions 61 to 63 of the restraining frames 6A to 6D are 10 to 50 mm from the ends of the vertical bars 4 and 4A to 4C. It is set as the structure formed by closely fitting to the said vertical beam 4 in the distant position.

  According to the first aspect of the present invention, since the holding frame is closely fitted to the vicinity of the end portion of each vertical beam screwed to the horizontal beam over more than half a circumference, each vertical beam is restrained at the end. The overall rigidity of the shape increases, and the vibration of the vertical beam is suppressed by the strong vibration control effect based on this rigidity, and the resonance phenomenon is less likely to occur. There is provided a handrail that is not rattled by the fitting portion of the restraining frame and thus is less likely to generate wind noise.

  According to the invention of claim 2, in the handrail described above, since the holding frame has an L-shaped vertical cross section, a sealed space in which rainwater accumulates between the holding frame and the horizontal frame does not occur, and therefore rainwater causes Corrosion degradation can be avoided.

  According to the invention of claim 3, in the handrail in which the restraining frame has an L-shaped vertical cross section, when the handrail is assembled, the vertical rail can be connected to the horizontal rail later, so that the assembling work is facilitated.

  According to the invention of claim 4, since the handrail restraining frame is integrated with the horizontal rail, there is no need to attach the restraining frame when assembling the handrail, and the work efficiency is improved accordingly.

  According to the fifth aspect of the present invention, in the handrail, since the holding frame is an independent member, the fitting portion can be easily formed.

  According to the invention of claim 6, the vertical beam is fitted by the two upper and lower horizontal wall portions of the holding frame, and both are fitted and held together by the fixing tool such as a screw, and the lower end surface of the vertical beam Since a gap can be formed between the main body and the upper surface of the horizontal beam main body, it is possible to prevent as much as possible the generation of noise due to the deflection or breakage of the vertical beam or the resonance phenomenon.

  According to the invention of claim 7, in the handrail described above, since the fitting portion of the holding frame is closely fitted at a position appropriately separated from the end of the vertical beam, the vibration suppression effect of the vertical beam is more It becomes larger and the noise caused by wind can be further reduced.

  Hereinafter, preferred embodiments of the handrail according to the present invention will be specifically described with reference to the drawings.

  1 to 3 show a handrail according to a first embodiment of the present invention. In these figures, 1 is a pair of left and right columns erected on the concrete frame 10, 2 is a headboard erected between the tops of both columns 1, 1, and 3 is a horizontal frame erected between the lower parts of both columns 1, 1. The crosspieces 4A are vertical crosspieces arranged in parallel at regular intervals in a rectangular frame constituted by the two columns 1, 1 and the headboard 2 and the horizontal crosspiece 3. Thus, all of the support column 1, the headboard 2 and the cross rail 3 are made of an aluminum extrusion mold material.

  The support column 1 and the vertical rail 4A in the handrail of the first embodiment have the same configuration as the handrail of the conventional example described above. As shown in FIG. 3, the support column 1 has a rectangular tube shape and has four inner corners. The longitudinal beam 4A has a rectangular tube shape that is slightly smaller in cross section than the column 1 and has two longitudinally continuous screw holes 4a ... in the longitudinal direction. Yes.

  On the other hand, the headboard 2 and the crosspiece 3 have the same configuration as the handrail of the conventional example described above. That is, as shown in FIG. 2, the headboard 2 is composed of a headboard main body 21 having an open U shape with a downward vertical section and a substantially strip-shaped headboard receiver 22 constituting the lower surface. By engaging the locking strips 22a, 22a provided on both side edges of the head support 22 with the locking frame portions 21a, 21a, an integral hollow frame is formed. In addition, the horizontal rail 3 includes a U-shaped horizontal rail main body 31 that opens downward, and a bottom plate 32 that is engaged with the lower surface of the horizontal rail main body 31. However, on the lower surface side of the headboard receiver 22 and the upper surface side of the crosspiece main body 31, a holding frame 6 </ b> A having an L-shaped vertical section with a horizontal wall portion 6 a and a vertical wall portion 6 b is formed on the horizontal wall portion. 6a is separated and connected by the vertical wall part 6b side.

  These representative frames 6A and 6A, as representatively shown on the side of the horizontal rail main body 31 in FIG. 4, are rectangular shapes having notches that open at the side edges at regular intervals along the longitudinal direction of the horizontal wall portion 6a. Fitting portions 61 are formed. The arrangement pitch of the fitting portions 61 in each holding frame 6A is equal to the arrangement pitch of the vertical rails 4A in the handrail, and each fitting portion 61 has a width in the left-right width when the vertical rail 4A is assembled. And the depth is set so that the depth exceeds half of the longitudinal width of the vertical beam 4A. This depth is equal to the entire width of the horizontal wall 6a in this embodiment. In FIG. 4, 31 c is a screw insertion hole provided in the upper wall portion 31 a of the horizontal rail main body 31 corresponding to each fitting portion 61, and is not illustrated, but the same is applied to the headboard receiver 22 side. These screw insertion holes are provided corresponding to the respective fitting portions 61.

  As shown in FIG. 2, the support column 1 and the coping 2 in this handrail are connected by screwing screws 5... Penetrating from the upper portion of the coping tray 22 into the screw holes 1 a of the support column 1. Further, as shown in FIGS. 2 and 3, the support post 1 and the lower horizontal cross 3 are connected to a plurality of protrusions 31 b... Integrally formed on the inner surfaces of both side walls of the horizontal cross main body 31. A notch in the longitudinal direction is made at the same position from the end of the wire, and the receiving plate 8 inserted into this notch and the side wall portion 1b of the supporting column 1 facing each other are attracted and fixed by tightening bolts and nuts 9.

  On the other hand, as shown in FIG. 2 and FIG. 3, each vertical rail 4 </ b> A has its upper and lower ends laterally connected to the lower surface of the headboard receiver 22 in a state in which both upper and lower ends are fitted to the fitting portions 61 of the upper and lower holding frames 6 </ b> A. The two upper and lower screws 5 are passed through the headboard receiver 22 from above and from the lower side through the upper wall portion 31a of the horizontal rail body 31 and screwed into the respective screw holes 4a. By being inserted, it is connected and fixed to the headboard receiver 22 and the crosspiece main body 31.

  Each of the vertical rails 4A in the handrail having the above-described structure is screwed at the upper and lower ends of the headboard holder 22 of the headboard 2 and the horizontal rail main body 31 of the horizontal rail 3, but the screws Since it is closely fitted to the fitting part 61 of the restraining frame 6A in the vicinity over half a circumference, the overall rigidity is large in a form in which the upper and lower end parts are constrained, and a strong damping action based on this rigidity is provided. The upper and lower end portions are fixed by the screw-fastening portion and the fitting portion by the holding frame 6A so that the movement hardly occurs. Therefore, when the handrail installed on the outdoor part receives wind, even if an excessive vortex is generated by the wind passing between the vertical bars 4A, the vertical bars 4A are less likely to be vibrated and are Since there is little backlash at the end, the occurrence of a hitting sound is suppressed, and in addition, the resonance effect does not occur in the range of wind speeds of about 3 to 8 m / second due to the vibration control effect, and thus there is no conventional control frame 6A. Compared with the handrail of the configuration, the noise level due to wind is significantly reduced.

  Therefore, in the handrail of the first embodiment, the holding frame 6A has an L-shaped longitudinal section, and the space between the holding frame 6A and the horizontal frame 3 is open to the outside. There is no concern of causing corrosion degradation due to rainwater accumulation. Further, each fitting portion 61 of the holding frame 6A is a rectangle corresponding to the rectangular tube-shaped vertical rail 4A and has a notch shape opened at the side edge of the horizontal wall portion 61. Therefore, when assembling the handrail, It is possible to attach the vertical beam 4A to the rectangular frame composed of the support columns 1, 1 and the headboard receiver 22 and the horizontal beam main body 31 from the side by retrofitting, thereby facilitating the assembly work. Furthermore, since the holding frame 6A is integrally formed with the headboard receiver 22 and the horizontal rail body 31, there is no need to attach the holding frame 6A when assembling the handrail, and the work efficiency is improved accordingly.

  5A to 5C show a handrail according to the second embodiment. In this handrail, instead of the rectangular tube-shaped vertical rail 4A in the handrail of the first embodiment, as shown in FIG. 5 (b), the four-circumferential side surface is composed of a front and rear side surface having a convex arc shape and a planar left and right side surface. A vertical beam 4B having a screw hole 4a continuous in the longitudinal direction at one inner side is used. A holding frame 6B corresponding to the vertical beam 4B is integrally formed on the lower surface side of the head member 22 of the head frame 2 and the upper surface side of the horizontal beam main body 31 of the lower horizontal beam 3. That is, the restraining frame 6B has an L-shaped vertical cross section with the horizontal wall portion 6a and the vertical wall portion 6b in the same manner as the restraining frame 6A of the first embodiment, but the side rail main body 31 side in FIG. As shown as a representative, the notch-shaped fitting portion 62 that opens to the side edge of the horizontal wall portion 6a is composed of straight side edges 62a, 62a and a concave arc-shaped back edge 62b. Yes.

  Thus, each vertical beam 4B has its upper and lower ends butted against the lower surface of the headboard holder 22 and the upper surface of the horizontal beam main body 31 with both upper and lower ends closely fitted to the fitting portions 62 of the upper and lower restraining frames 6B. Each of the upper and lower screws 5 passes through the upper wall 31a of the headboard receiver 22 and the horizontal rail body 31 and is screwed into the screw hole 4a, whereby the headboard receiver 22 and the horizontal rail body 31 are connected and fixed. ing. In addition, since structures other than these are the same as those of the first embodiment, portions common to the first embodiment are denoted by the same reference numerals and description thereof is omitted.

  Also in the handrail of the second embodiment, each vertical rail 4B is closely fitted to the fitting portion 62 of the restraining frame 6B in the vicinity of the screwed upper and lower end portions over about 3/4 round. The overall rigidity is large, and a strong vibration control action based on this rigidity is provided, and the upper and lower ends are less likely to move. Therefore, when the handrail is subjected to wind, the vertical rail 4B is less likely to bend and vibrates, and the upper and lower ends thereof are less rattling. The resonance phenomenon does not occur in the range of about / sec, and the noise becomes very small. Also in this handrail, the vertical beam 4B can be assembled from the side by retrofitting from the fitting form of the vertical beam 4B and the fitting portion 62 of the holding frame 6B.

  FIGS. 6A and 6B show the lower part of the handrail of the third embodiment. This handrail uses a vertical beam 4C which is cylindrical and has screw holes 4a and 4a continuous in the longitudinal direction at two locations on the inner side, and corresponds to the vertical beam 4C on the headboard holder (not shown) and the horizontal frame body 31. A holding frame 6C is integrally formed. That is, the holding frame 6C has an L-shaped vertical cross section with the horizontal wall portion 6a and the vertical wall portion 6b in the same manner as the holding frames 6A and 6B of the first and second embodiments. Is formed with a notched circular fitting portion 63 corresponding to the circular cross-sectional shape of the vertical beam 4C opening at the side edge.

  Also in the handrail of the third embodiment, each vertical rail 4C is closely fitted to the fitting portion 63 of the restraining frame 6C in the vicinity of the screwed upper and lower end portions over about 3/4 round, and the entire rigidity is increased. Large and strong vibration-damping action, and the upper and lower ends are difficult to move, so that it is difficult for vibrations to bend when receiving wind, and the occurrence of impact noise due to rattling of the upper and lower ends is suppressed. Therefore, the resonance phenomenon does not occur in the range of the wind speed of about 3 to 8 m / second, and the noise becomes very small.

In addition, since the handrail of the third embodiment has a shape in which the fitting portion 63 of the restraining frame 6C is closely fitted to a half or more of the cylindrical vertical rail 4C, when assembling the handrail, each vertical rail 4c is It is necessary to fix the end to the head 6 and the horizontal frame body 31 in a form that is fitted in the frame 6D in advance. However, as shown by the one-dot chain line 6a ₁ in FIGS. 6 (a) and 6 (b), if the fitting portion 63 is a semicircular shape that closely fits the half circumference of the vertical beam 4C, the vertical beam 4C is laterally moved. It becomes possible to assemble from after. On the other hand, in the assumption that no assembled in retrofit the said longitudinal bars 4C, instead of the notch-shaped fitting portions 63 may be circular hole as indicated by the two-dot chain line 6a ₂ of FIG.

  In the handrail of the present invention, the first to third embodiments described above are used to reliably exhibit the vibration damping effect and the fixing effect of the vertical beam by the restraining frame and to sufficiently reduce the noise level due to the wind. As described above, the fitting portion of the holding frame needs to be closely fitted to the vertical rail over 50% or more of the circumference. Further, the fitting position is not particularly limited, but it is recommended to set the fitting position at a position 10 to 50 mm away from the end of the vertical rail in order to obtain a high vibration damping effect.

  On the other hand, with respect to the holding frame, in addition to being integrally formed on the horizontal rail (including the headboard) as in the first to third embodiments described above, for example, an independent member such as a handrail in the following fourth embodiment. It is good. FIG. 7 shows a state in which a restraining frame 6D, which is an independent member, is attached to the horizontal rail main body 31 as a handrail of the fourth embodiment. Similar to the holding frames 6A to 6C in the first to third embodiments, the holding frame 6D has a horizontal wall portion 6a and a vertical wall portion provided with fitting portions (not shown) that closely fit the vertical rail 4A. 6b has an L-shaped longitudinal cross section, and a mounting strip 6c that protrudes in a direction opposite to the horizontal wall 6a is formed on a side edge of the vertical wall 6b opposite to the horizontal wall 6a. It is provided continuously over the entire length, and is fixed to the upper wall portion 31a of the horizontal rail main body 31 via the screws 7 in the mounting strip 6c. Although not shown, the same restraining frame 6B is screwed on the headboard side.

  When the restraining frame is an independent member as in the handrail of the fourth embodiment, it takes time and labor for mounting to the horizontal beam (including the headboard), but the structure itself is more than the one integrated with the horizontal beam. Since it becomes simple and lightweight, there exists an advantage that the process at the time of forming a fitting part in raw materials, such as an aluminum extrusion mold material, becomes easy.

FIG. 8 shows a restraining frame 6E of the fifth embodiment. In this embodiment, the restraining frame having a substantially F-shaped cross section composed of two upper and lower horizontal wall portions 6a and 6c and a vertical wall portion 6b. 6E is integrally formed with the horizontal beam main body 31 (or also with the headboard holder 22), and the fitting portions 63 are provided on the upper and lower horizontal wall portions 6a and 6c, respectively. A fixing member 80 such as a screw or a blind rivet is fixed to the vertical beam 4A on the vertical wall portion 6a ₁ between the wall portions 6a and 6c. In this embodiment, the upper and lower two steps of the holding frame 6E are provided. The vertical beam 4A is fitted by the horizontal walls 6a and 6c, and both are fitted and held together by a fixing tool 80 such as a screw. Further, the lower wall of the vertical beam 4A and the upper surface 31a of the horizontal beam main body 31 are connected to each other. Since the gap α can be formed between them, the vertical beam 4A may be further bent or damaged. It is possible to prevent the generation of noise due to the resonance phenomenon as much as possible.

  In the handrails of the first to fifth embodiments described above, the upper end of the vertical beam is screwed to the headboard receiving portion 22 of the headboard 2. However, in the handrail having a structure having an upper side rail separately from the headboard. Needless to say, the upper side of the vertical beam is screwed to the upper horizontal beam, and a holding frame on the upper side is provided along the upper horizontal beam. Moreover, the handrail of this invention should just provide the control frame in the at least one side of the upper and lower horizontal rail. This is because a sufficient noise reduction effect can be obtained even if the restraining frame is provided only on one of the upper and lower sides depending on the wind direction and wind speed region assumed at the installation location of the handrail.

  Further, the handrail of the present invention is designed in various ways other than the embodiment, such as the outer shape and structure of each structural member such as a headboard, a horizontal beam, a vertical beam, and a column, and a connection structure between components excluding the vertical beam. It can be changed.

[Noise measurement test]
As shown in FIG. 12, the silencing wind tunnel S and the reverberation room R are connected by a rectangular tube-shaped ventilation duct D of 1 m in length and width, and at a position 1.5 m away from the outlet opening of the ventilation duct D in the reverberation room R. A handrail T of the specimen was installed, and the silent wind sent from a blower (not shown) on the upstream side of the silencing wind tunnel S was set to be blown onto the handrail T through the ventilation duct D. And as the handrail T, the thing of the conventional structure shown in FIGS. 8-10 mentioned above and the thing of 1st embodiment shown in FIGS. 1-3 are used, and the installation angle with respect to a ventilation direction and a wind speed differ. Under these conditions, the dynamic pressure is measured by the Pitot tube P installed in the ventilation duct D, the wind speed is obtained from this dynamic pressure, and the reverberation is performed by the microphone M installed on the floor 4.5 m above the reverberation chamber R. The indoor average diffuse sound pressure level (SPL) was measured, and the reverberation room was corrected by the following formula to determine the self-generated sound power level (PWL) of the handrail T at various wind speeds and installation angles. The results are shown in FIG. 13 (a) for the handrail of the conventional configuration, and in FIG. 13 (b) for the handrail of the first embodiment. The dimensional configuration of both handrails is as follows, and the difference between them is only the presence or absence of the restraining frame 6A.

[Dimensions of handrails]
The height of the above-ground part ... 1070 mm.
Posts 1,11: front and rear width 60mm, left and right width 30mm.
Headboard 2,12 ... Length 2000mm, width 100mm, height 30mm.
Lower crosspieces 3, 13... 1800 mm in length, 50 mm in width, and 30 mm in height.
Vertical beam 4A, 14 ... length 980mm, front-rear width 35mm, left-right width 20mm.
Upper and lower restraining frame 6A: The fitting portion 61 has a depth of 20 mm = fitted to about 54.5% of the circumferential length of the vertical beam 4A, and the fitting position = 20 mm from the upper and lower ends of the vertical beam 4A.

  As shown in FIG. 13 (a), in the handrail of the conventional configuration, in particular, the installation angle at which the handrail surface direction is perpendicular to the blowing direction is 0 °, and the installation angles are 0 °, 15 °, and 30 °. When the wind speed is about 3 to 8 m / sec, the noise level is remarkably increased. Even in a wind that is not so strong, the noise is abnormally increased by the resonance phenomenon, and when the wind speed is 14 m / sec or more, the installation angle is 0. It can be seen that the noise level rises sharply even in the range of ˜45 °. On the other hand, as shown in FIG. 13 (b), the noise caused by the handrail of the configuration of the present invention increases substantially proportionally to the wind speed, but the abnormal increase in noise at a wind speed of about 3 to 8 m / sec. It is clear that there is no sudden rise at a wind speed of 14 m / sec or more, and that the level can be kept low.

It is a front view of the handrail which concerns on 1st embodiment of this invention. It is a vertical side view of the handrail. It is the cross-sectional top view of the handrail. It is a perspective view of the horizontal beam main body of the lower horizontal beam used for the handrail. The handrail which concerns on 2nd embodiment of this invention is shown, (A) is the whole vertical side view, (B) is a cross-sectional top view of the principal part, (C) is a perspective view of the crosspiece main body of a lower side crosspiece is there. The handrail which concerns on 3rd embodiment of this invention is shown, (A) is a vertical side view of a lower part, (B) is a transverse plane view of the principal part. It is a perspective view of the horizontal beam main body of the lower horizontal beam in the handrail which concerns on 4th embodiment of this invention. The handrail which concerns on 5th embodiment of this invention is shown, (A) is a cross-sectional top view of the principal part, (B) is a vertical side view of a lower part. It is a front view of the handrail of a conventional structure. It is a vertical side view of the handrail. It is the cross-sectional top view of the handrail. It is a top view which shows the outline of the measurement part in a noise measurement test. The correlation characteristics between the duct surface wind speed and the self-generated noise level in the noise measurement test are shown, (A) is a characteristic diagram of a handrail of a conventional configuration, and (B) is a characteristic of the handrail according to the first embodiment of the present invention. FIG.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 support | pillar 2 coping 21 coping main body 22 coping base 3 lower horizontal crossing 31 horizontal crossing main body 4,4A-4C vertical crossing 5 screw 6A-6D restraining frame 6a horizontal wall part 6b vertical wall part 61-63 fitting part 7 screw T hand Sliding

Claims (7)

A plurality of vertical beams made of a metal hollow extrusion mold material with a screw hole continuous in the longitudinal direction on the inside between the upper and lower metal horizontal beams, the upper and lower end surfaces are butted against the horizontal beam, and are screwed into the screw holes from the horizontal beam side. It is connected at regular intervals via screws to enter,
At least one side of the upper and lower horizontal rails is provided with a holding frame in parallel with the horizontal rails, which has a plurality of fitting portions that closely fit over 50% of the length of the vertical rail in the vicinity of the end of each vertical rail. Handrails that have been made.   The handrail according to claim 1, wherein the holding frame has an L-shaped vertical cross section with a horizontal wall portion and a vertical wall portion provided with the fitting portions at predetermined intervals.   The handrail according to claim 2, wherein the fitting portion of the holding frame is formed in a cutout shape that opens at a side edge of the horizontal wall portion, and has a shape that allows the vertical rail to be fitted in the horizontal direction.   The handrail according to any one of claims 1 to 3, wherein the holding frame is integrally formed with a horizontal rail.   The handrail according to any one of claims 1 to 3, wherein the holding frame is screwed to a horizontal rail.   The handrail according to any one of claims 1 to 5, wherein the holding frame has a substantially F-shaped vertical cross section with a horizontal wall portion and a vertical wall portion of two upper and lower stages. The handrail according to any one of claims 1 to 5, wherein the fitting portion of the holding frame is closely fitted to the vertical beam at a position 10 to 50 mm away from an end of the vertical beam.

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