JP2018186440A - Supporting metal fitting for antenna installation - Google Patents

Abstract

PROBLEM TO BE SOLVED: To fix a supporting metal fitting for antenna installation to a parapet formed on the roof of a building.SOLUTION: A supporting metal fitting 30 for antenna installation includes a metal fitting body 31 having an inverted U-shaped longitudinal section and a column support metal fitting 32 provided upright on the metal fitting body 31. Nuts 38a are connected to both sides of the lower end portions of the L-shaped metal fittings 33A and 33B of the metal fitting body 31. As a shaft portion of a push bolt 40 is screwed into the nut 38a, a holding plate 39 grips a rooftop parapet, and the supporting metal fitting 30 is attached to the parapet.SELECTED DRAWING: Figure 1

Description

  The present invention relates to a support fitting for installing an antenna using a parapet on a roof of a building.

  Patent Document 1 discloses a technique for installing an antenna using a rooftop parapet. Referring to FIG. 10, the fixed frame (support metal fittings) 1 includes a pair of frame pairs 5 a and 5 b formed in an inverted U shape and a pair of frame pairs 5 a and 5 b connected to the front body 1 a, The connecting pieces 6a to 6c constituting the back body 1b and press contact plates (pressing plates) 2a and 2b screwed to the lower ends of the frame pairs 5a and 5b are provided.

  The connecting pieces 6a and 6b of the front body 1a include a mast standing portion 8 for standing the antenna installation mast 3, and the mast standing portion 8 includes a mast holder 13, a bolt 14, and a clamping member 15. Yes. Moreover, the recessed part 20 for bolt contact | abutting is formed in the back surface center of the press-contacting board 2a, and the screw hole into which the volt | bolt 21 is screwed in in each lower end part of frame 5a, 5b is formed.

  When installing such a fixed frame 1 on the parapet, first, the interval between the pressure contact plates 2a and 2b is opened wider than the thickness of the parapet, and then the fixed frame 1 is covered so that the parapet is inserted between the pressure contact plates 2a and 2b. .

  Then, the bolt 21 is screwed into the screw hole to push the pressure contact plate 2a toward the parapet, and grip the parapet together with the pressure contact plate 2b. Further, the mast 3 is attached to the mast standing portion 8, and an antenna is attached to the mast 3.

JP 2001-237622 A

  However, in the fixed frame 1 of Patent Document 1, since the bolt 21 for pushing the pressure contact plates 2a and 2b is provided only on one side, that is, the front frame 5a side, the gripping force of the parapet is insufficient. May not be able to be fixed sufficiently.

  Thereby, the fixing of the fixed frame 1 is released due to, for example, a wind or rain, and the antenna may fall down. This creates danger around the building and may adversely affect the communication area.

  The present invention is made to solve such a conventional problem, and an object of the present invention is to sufficiently fix a support fitting for antenna installation to a parapet.

  The present invention relates to an antenna support fitting for installing an antenna using a parapet formed on the roof of a building. The antenna support bracket includes a bracket body having an inverted U-shaped vertical cross section, a support bracket that is erected on the bracket body, nuts that are fixed to both sides of each lower end of the bracket body, and a screw threaded on the nut. And a pressing plate for tightening and holding the parapet as the pressing bolt is screwed into the nut.

  As one aspect of the present invention, a plurality of nuts can be connected in series on both sides of each lower end of the metal fitting body. Further, the metal fitting body and the column metal fitting may be provided with a hole through which a drop preventing wire can be inserted.

  As another aspect of the present invention, the metal fitting body may include a pair of L-shaped metal fittings and bolts and nuts that connect the L-shaped metal fittings. In this case, each L-shaped bracket includes a horizontal portion in which a plurality of connection holes are formed along the longitudinal direction, and the lower end portion that is bent vertically from one end of the horizontal portion.

  Therefore, the L-shaped metal fittings are connected by fastening nuts to the bolt shaft portions communicating with the connection holes. It is preferable that the distance between the presser plates can be adjusted by changing the connecting hole communicating with the bolt shaft portion.

  As still another aspect of the present invention, the metal fitting body may be configured by connecting a pair of L-shaped metal fittings. In this case, one said L-shaped metal fitting is formed in the cross-sectional U shape, and forms a some through-hole along the longitudinal direction of the side plate erected at the both ends of the bottom plate.

  Moreover, the said support | pillar metal fitting is provided with the base plate in which the attachment hole for the attachment with respect to the said L-shaped metal fitting was formed, and the support | pillar part erected in this base plate. The base plate is attached to the L-shaped metal fitting by fastening a nut to a bolt shaft portion communicating with the through hole and the attachment hole. Therefore, by changing the mounting hole communicated with the bolt shaft portion, the mounting position of the support bracket can be adjusted.

  According to the present invention, the support bracket for antenna installation can be sufficiently fixed to the parapet.

The perspective view of the support metal fitting for antenna installation which concerns on embodiment of this invention. The perspective view which shows the connection state of the same L-shaped metal fittings. The perspective view which shows the attachment state of the same volt | bolt and the countersunk | bolt bolt for prevention of presser plate fall. The perspective view which shows the attachment state of the presser plate The perspective view which shows the attachment state of the support | pillar metal fitting. The perspective view of the state which attached the support metal fitting to the parapet. (A) is a side view which shows the state of the parapet attachment width (240 mm) of a metal fitting main body, (b) is a side view which shows the state of the same parapet attachment width (360 mm). (A) is a side view which shows the state which applied the stress of the arrow P direction to the comparative example, (b) is a side view which shows the state which applied the stress to the antenna support metal fitting which concerns on this embodiment. (A) is a side view showing a state in which the support metal fitting is attached to the front side of the support fitting, (b) is a side view showing a state in which the support fitting is attached to the center of the support fitting, and (c) is attached to the rear side of the support fitting. FIG. The perspective view of the fixed frame of patent document 1. FIG.

  Hereinafter, support brackets for antenna installation according to embodiments of the present invention will be described. This support bracket is attached to a roof parapet when the antenna (ANT-Z-P040-ND) is installed mainly on the roof of a building, and supports the antenna.

≪Overall structure≫
The structure of the said support metal fitting is demonstrated based on FIGS. Here, as shown in FIG. 1, the support metal fitting 30 includes a metal fitting body 31 having an inverted U-shaped longitudinal section fixed to the parapet, and a column fitting 32 that is erected on the metal fitting body 31 and on which the antenna is installed. And.

(1) Bracket body 31
The metal fitting body 31 includes a pair of L-shaped metal fittings 33A and 33B, and a bolt 34a and a nut 34b for connecting both L-shaped metal fittings 33A and 33B. As shown in FIG. 2, each L-shaped metal fitting 3333A, 33B includes a horizontal portion 35A, 35B having a U-shaped cross section, and a lower end portion (leg portion) that is vertically bent from one end of the horizontal portions 35A, 35B. 36A and 36B, and the horizontal portion 35B is connected to the lower side of the horizontal portion 35A.

  The longitudinal direction of the horizontal portion 35A is set longer than the horizontal portion 35B, and the lower end portion 36A is set higher than the lower end portion 36B. Specifically, the horizontal portions 35A and 35B are formed in a U-shaped cross section, and a plurality of communication holes 35c are formed in series at equal intervals in the bottom plate 35a. Both L-shaped metal fittings 33A and 33B are connected by fastening a nut 34b via a washer to a shaft portion of a bolt 34a communicated with the communication hole 35c of both horizontal portions 35A and 35B. Further, four through holes 35d for attaching the column metal fittings 32 are formed at equal intervals on each side wall 35b of the L-shaped metal fitting 33A.

  Each lower end portion 36A, 36B is formed in a U-shaped cross section, and a pair of nuts 38a are connected in series to the outer periphery of the left and right side plates 38 by welding, and the bottom plate 37 is provided with a hole 44 and a drop prevention A wire attachment hole 37a is formed. Here, both nuts 38a are connected at regular intervals, while the presser plate 39 is attached by fastening the nut 43 to the shaft portion of the countersunk bolt 42 inserted through the hole 44.

  As shown in FIG. 3, the presser plate 39 is formed in a horizontally long rectangular shape, and round grooves 39a are formed at positions corresponding to the nuts 38a at both ends. At this time, the end of the shaft portion of the presser bolt 40 screwed into each nut 38a hits the round groove 39a so that both presser plates 39 grip the parapet, and the metal fitting body 31 is fixed to the parapet.

(2) Support bracket 32
As shown in FIG. 1, the support bracket 32 includes a base plate 45 that is fixed to the L-shaped bracket 33 </ b> A, and a support portion 46 that is erected substantially at the center of the base plate 45. Both side end portions 45a of the base plate 45 are bent downward and include a pair of mounting holes 45b (see FIG. 5) formed at the same interval as the through holes 35d of the L-shaped metal fitting 33A.

  The base plate 45 is fixed to the L-shaped metal fitting 33A by fastening a nut 49 to a shaft portion of a bolt 48 inserted through both the mounting holes 45b and a pair of arbitrarily selected through holes 35d. In addition, the support | pillar part 46 is formed in a column shape, and the wire attachment hole 47 for fall prevention is formed in the upper end vicinity.

≪Mounting procedure≫
Hereinafter, a procedure for attaching the support fitting 30 to the parapet will be described. Here, it is assumed that the support fitting 30 is attached to the parapet P (see FIG. 6). This mounting is performed by connecting the L-shaped brackets 33A and 33B (FIG. 2) → the mounting operation of the push bolt 40 (FIG. 3) → the mounting operation of the holding plate 39 (FIG. 4) → the mounting operation of the column bracket 32 (FIG. 5). → It will be carried out in the order of attachment to the parapet (Fig. 6).

(1) Connecting operation of L-shaped brackets 33A and 33B The connecting operation of L-shaped brackets 33A and 33B will be described with reference to FIG. First, as shown in FIG. 2, the horizontal portion 35B of the L-shaped bracket 33B is disposed below the horizontal portion 35A of the L-shaped bracket 33A, and the bottom plates 35a of the horizontal portions 35A and 35B are opposed to each other.

  In this state, a pair of adjacent communication holes 35c corresponding to the thickness L of the parapet P is selected from the group of communication holes 35c of the horizontal portions 35A and 35B, and the shaft portion of the bolt 34a is inserted into each selected communication hole 35c. Communicate. A nut 34b is fastened to the shaft portion of the bolt 34a communicated here via a washer, and both L-shaped metal fittings 33A and 33B are connected.

(2) Installation work of the push bolt 40 / Installation work of the presser plate 39 First, the installation work of the push bolt 40 will be described with reference to FIG. In this mounting operation, the shaft portion of the push bolt 40 is screwed to the nuts 38a of the lower end portions 36A and 36B via the locking nut 50a and the spring washer 50b.

  At this time, the countersunk bolt 42 is attached to the presser plate 39 by inserting the shaft part of the countersunk bolt 42 into the central hole 39 b of the presser plate 39 and fastening the nut 51 to the shaft part of the inserted countersunk bolt 42.

  Next, the mounting operation of the presser plate 39 will be described with reference to FIG. 4. The shaft portion of the countersunk bolt 42 is inserted into the hole 44 of each of the lower end portions 36A and 36B, and the nut 43 is inserted into the shaft portion of the inserted countersunk bolt 42. Are fastened and the presser plates 39 are attached to the lower end portions 36A and 36B.

(3) Mounting operation of the support bracket 32 The mounting operation of the support bracket 32 will be described with reference to FIG. In this mounting operation, four through holes 35d corresponding to the mounting positions of the column brackets 32 are selected from the group of through holes 35d formed in the both side plates 35b of the L-shaped bracket 33A. Here, through-holes 35d that are adjacent to each other in the side plates 35b and that face each other between the side plates 35b are selected.

  The shaft portion of the bolt 48 is inserted into each through hole 35d selected in this way and the mounting hole 45b of the base plate 45, and the nut 49 is fastened to the shaft portion of the inserted bolt 48 via a washer. Is attached to the L-shaped bracket 33A.

(4) Attachment work to a parapet The attachment work to a parapet is demonstrated based on FIG. When attaching the support fitting 30, first, the opening between the lower end portions 36A, 36B is arranged in a direction perpendicular to the longitudinal direction of the parapet P (Y-Y direction).

  Next, the position of the press plate 39 is adjusted so that the end of the shaft portion of the push bolt 40 faces the round groove 39a of the press plate 39, and the shaft portion of each push bolt 40 is connected to each leg portion 36A, 36B. Screw into the nut 38a.

  As a result, the end of the shaft portion of the presser bolt 40 hits the round groove 39a, and the parapet P is tightened by the left and right presser plates 39. As a result, the parapet P is held by the both presser plates 39, and the support fitting 30 is fixed to the parapet P. Further, each locking nut 50a is fastened to the shaft portion of the presser bolt 40 to such an extent that the spring washer 50b is effective, and then the nut 43 is fastened to the flat bolt 42 in a two-unit manner.

  Thereafter, the fall prevention wire 59 is inserted into the mounting holes 47 and 37a and connected to the anchor bolt 60 embedded in the rooftop of the building, and the antenna (ANT-Z-P040-ND) is installed on the support bracket 32. Finish the work. According to the support fitting 30, the following effects (A) to (D) can be obtained.

  (A) That is, if the both communication holes 35c that communicate the shaft portion of the bolt 34a are changed, the distance between the lower end portions 36A and 36B expands and contracts, so that the distance between the left and right presser plates 39 can be adjusted. This point will be described with reference to FIG.

  FIG. 7A shows a state in which the distance between the lower end portions 36A and 36B is adjusted and the distance between the presser plates 39 is set to a distance L1 (240 mm). FIG. 7B shows a state in which the distance between the lower end portions 36A and 36B is adjusted and the distance between the presser plates 39 is set to a distance L2 (360 mm).

  Thus, the distance between the presser plates 39 can be adjusted to the distance L1 to the distance L2 by selecting the communication hole 35c that communicates the shaft portion of the bolt 34a. Therefore, according to the support bracket 30, it is possible to cope with a parapet having a thickness L (240 mm to 360 mm), and the installation range of the antenna can be expanded in this respect.

  (B) According to the support bracket 30, as shown in FIG. 6, when the shaft portion of each push bolt 40 is screwed into each nut 38a, the parapet P is moved by the left and right press plates 39. Since it is gripped, the gripping force of the parapet P is improved as compared with Patent Document 1.

  That is, in Patent Document 1, the bolt 21 is screwed into the screw hole from one side to push the pressing plate 2a to the parapet side, and the parapet is sandwiched between the pressing plates 2a and 2b.

  On the other hand, the support fitting 30 sandwiches the push bolt 40 while tightening it from both sides in order to surely exert the gripping force of the parapet P. Thereby, it is possible to improve the gripping force of the parapet P, which is insufficient on only one side, and to sufficiently and reliably fix the support fitting 30 to the parapet P, thereby improving safety.

  At this time, according to the support fitting 30, since the nuts 38a into which the push bolts 40 are screwed are provided in series, the core shaft of the push bolts 40 can be prevented from being displaced when a load is applied. This point will be described with reference to FIG.

  FIG. 8A shows the misalignment of the core axis of the support fitting 30 'according to the comparative example. In the support fitting 30 ′, one nut 38 b is individually mounted on both ends of the bottom plate 37 of the fitting main body 31, and the hole 52 that communicates with the female screw hole of each nut 38 b is formed in the bottom plate 37. Here, if the presser bolts 40 are screwed into the nuts 38 b, the presser bolts 40 push the left and right presser plates 39 through the holes 52, so that the parapet P is sandwiched between the presser plates 39.

  However, when a stress S in the vertical direction of the parapet (XX direction in FIG. 6) is applied to the support fitting 30 ', a core axis deviation in the direction of arrow S1 occurs in the presser bolt 40 on the lower end 33B side, and the lower end A center axis deviation in the direction of arrow S2 occurs in the presser bolt 40 on the side of the portion 33A. Thereby, the distortion shown by the two-dot chain line in the figure occurs in the metal fitting body 31 of the support metal fitting 30 ', that is, the sandwiching portion, and the gripping force of the parapet P may be insufficient.

  On the other hand, FIG.8 (b) has shown the state which applied the said stress S to the said support metal fitting 30 similarly to Fig.8 (a). Here, since the nut 38a is continuously connected to the outer periphery of the side plate 38, as shown by the two-dot chain line in the figure, the misalignment of the core axis in the directions of the arrows S1 and S2 is suppressed, and the distortion of the sandwiched portion is reduced. doing.

  That is, since the shaft portion of the presser bolt 40 is supported by both nuts 38a, the core shaft deviation is suppressed as compared with the comparative example. At this time, as the distance between the nuts 38a increases, the center axis deviation of the presser bolt 40 decreases. Thereby, one nut 38a approaches the presser plate 39, and the grip of the parapet P can be stabilized.

  Tables 1 and 2 show the results of the strength test against the wind load of the support fitting 30, and Table 3 shows the results of the test of the support fitting 30 'according to the comparative example. Table 1 shows the amount of distortion in the parapet direction (XX direction in FIG. 6) in the “adaptive wind speed / installation height” in Table 4. Tables 2 and 3 show the amount of distortion in the parapet vertical direction (Y-Y direction in FIG. 6) in the “adaptive wind speed / installation height” in Table 4.

  Here, a dial gauge (not shown) is installed on the presser plate 39 to measure “amount of distortion of the sandwiching portion”, and the dial gauge is installed on the column 46 to measure “a strain of the support column”. Moreover, the load amount shown in Tables 1 to 3 was applied to the column 46 to measure the “distortion amount at the time of loading”, and the load amount was removed to measure the “distortion amount at the time of unloading”.

  According to Table 1 and Table 2, it is shown that the respective distortion amounts are in the allowable range in the “adaptive wind speed / installation height” of the category A in Table 4, and the gripping force of the parapet P in the support bracket 30 is improved. Was confirmed. Here, a case where the distortion amount of the sandwiched portion is restored to “0.00” at the time of unloading is set as an allowable range (determination = OK).

  Further, according to Tables 1 and 2, it is shown that the amount of distortion (Tables 1 and 2) of the support fitting 30 is smaller than the amount of distortion of the comparative example shown in Table 3. Therefore, it has been confirmed that if the nut 38a is connected in series to the outer periphery of the side plate 38, the center axis deviation of the presser bolt 40 can be reduced.

  (C) According to the support bracket 30, the support bracket 32 is selected by selecting the four through holes 35 d through which the shaft portions of the bolts 48 are inserted from the through holes 35 d of the both side plates 35 b according to the mounting position of the support bracket 32. The mounting position can be adjusted.

  For example, as shown in FIG. 9A, if four through-holes 35d on the L-shaped metal fitting 33A side are selected from the group of through-holes 35d, the post metal fitting 32 is placed on the front side (P side in the figure) of the horizontal portion 35A. Can be attached.

  Further, as shown in FIG. 9B, if four through-holes 35d arranged in the center of the horizontal portion 35A are selected from the group of through-holes 35d, the horizontal direction of the horizontal portion 35A (P- The support fitting 32 can be attached to the center in the Q direction).

  Further, as shown in FIG. 9 (c), if four through holes 35d on the L-shaped metal fitting 33B side are selected from the group of through holes 35d, the post metal fittings on the rear side (Q side in the figure) of the horizontal portion 35A. 32 can be attached.

  As a result, the antenna mounting position can be adjusted according to the surrounding conditions such as the length of the variable bracket on the antenna side and the antenna mounting direction, and the antenna can be prevented from crossing the building boundary line. . That is, even if it becomes clear that the antenna crosses the site boundary after attaching the support fitting 30 to the parapet P, the attachment position of the column fitting 32 is adjusted as shown in FIGS. It is possible to put the antenna in the site boundary.

  (D) A fall prevention wire 59 is inserted into the mounting holes 47 and 37a of the support fitting 30, and the fall prevention wire 59 is connected to an anchor bolt 60 embedded on the roof of the building. Therefore, according to the support metal 30, even if it is detached from the parapet P at the time of a disaster such as an earthquake, the fall prevention wire 59 can prevent the fall from the roof, and in this sense, safety is improved.

  In addition, this invention is not limited to the said embodiment, It can deform | transform and implement within the range described in each claim. For example, the fall prevention wire 59 can be connected to an existing fixed object in a building or the like, and may be used by being inserted into a through-hole 35d that was not used for attaching the support bracket 32.

  Further, it is preferable that a plurality of nuts 38a are connected to the outer periphery of each side plate 38 (but not limited to two), but one nut 38a is mounted on each side plate 38 as in the comparative example. It may be. In this case, although the center axis deviation of the presser bolt 10 is larger than that of the support fitting 30, the effect of improving the gripping force by the left and right presser plates 39 can be obtained.

DESCRIPTION OF SYMBOLS 30 ... Support metal fitting for antenna installation 31 ... Metal fitting body 32 ... Prop metal fitting 33A, 33B ... L-shaped metal fitting 34a, 48 ... Bolt 34b, 49 ... Nut 35A, 35B ... Horizontal part 35c ... Communication hole 35d ... Through-hole 36A, 36B ... Lower end 38a ... Nut 39 ... Presser plate 40 ... Pushing bolt 45 ... Base plate 45b ... Mounting hole 46 ... Post

Claims (5)

An antenna support bracket for installing an antenna using a parapet formed on the roof of a building,
A vertical U-shaped bracket body,
A column metal fitting standing on the metal fitting body,
Nuts fixed to both sides of each lower end of the metal fitting body;
A push bolt screwed into the nut;
A presser plate that tightens and holds the parapet as the push bolt is screwed into the nut;
A support bracket for antenna installation, comprising:   The antenna mounting bracket according to claim 1, wherein a plurality of nuts are connected in series on both sides of each lower end of the bracket body. The antenna mounting support bracket according to claim 1 or 2, wherein the bracket main body and the support bracket include a hole portion through which a drop prevention wire can be inserted. The metal fitting body includes a pair of L-shaped metal fittings and bolts and nuts for connecting the L-shaped metal fittings.
Each L-shaped bracket includes a horizontal portion in which a plurality of connecting holes are formed along the longitudinal direction, and the lower end portion that is vertically bent from one end of the horizontal portion,
The L-shaped metal fittings are coupled by fastening nuts to bolt shaft portions communicated with the coupling holes.
The antenna mounting bracket according to any one of claims 1 to 3, wherein a distance between the presser plates can be adjusted by changing the connecting hole that communicates the bolt shaft portion. . The metal fitting body is configured by connecting a pair of L-shaped metal fittings,
At least one of the L-shaped brackets is formed in a U-shaped cross section, and a plurality of through holes are formed along the longitudinal direction of the side plates erected on both ends of the bottom plate,
The support bracket includes a base plate in which a mounting hole for mounting to the L-shaped bracket is formed;
And a support column erected on the base plate,
The base plate is attached to the L-shaped bracket by fastening a nut to a bolt shaft portion communicated with the through hole and the attachment hole,
The antenna installation support according to any one of claims 1 to 3, wherein the mounting position of the support bracket can be adjusted by changing the mounting hole communicated with the bolt shaft portion. Hardware.

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