Support bracket

Abstract

To strongly fix a support metal fitting for an antenna installation.SOLUTION: A support metal fitting 10 comprises: a main body metal fitting 11 formed in a pipe like; a support metal fitting 12 that supports an antenna 21a so as to be attached to the main body metal fitting 11; and a pair of pipe-like leg metal fittings 13 and 14 gripping a parapet P. In both sides of a leg pipe 25 constructing each leg metal fitting 13, a high nut 29 is welded. In the high nut 29, a shaft part of a pressing bolt 32 is screwed, and a tip end side of the shaft part is fastened to a bolt bearing part 31a welded to a pressing board 31. When the shaft part of pressing bolt 32 is screwed to the high nut 29, the pressing board 31 is pressed, and the parapet P is gripped and fixed between the leg parts 13 and 14.SELECTED DRAWING: Figure 1

Description

[Technical Field]

[0001] The present invention relates to a support bracket that utilizes a parapet on the roof of a building to support an object such as an antenna or a cable. [Background technology]

[0002] For example, Patent Document 1 is known as a support fitting for installing an antenna or the like on a rooftop parapet. Outlined based on Figure 11(a), the support fitting 1 in Patent Document 1 comprises a fitting body 2 formed in an inverted U-shape in vertical cross section, and a support fitting 3 erected on the fitting body 2.

[0003] This metal fitting body 2 is formed by connecting L-shaped metal fittings 2A and 2B. A pair of nuts 4 is attached by welding to both sides of the lower end of each of these L-shaped metal fittings 2A and 2B.

[0004] 11(b), as the pressing bolts 5 are threaded into the group of connecting nuts 4, the holding plate 6 tightens and grips the parapet P. This fixes the support bracket 1 to the parapet, and then the antenna is attached to the support bracket 3. [Prior art documents] [Patent documents]

[0005] [Patent Document 1] Patent No. 6948823 Summary of the Invention [Problem to be solved by the invention]

[0006] Patent Document 1 aims to improve the gripping force of the parapet P by using a group of four connected nuts. However, nowadays, antennas and other items that are larger than before are often attached to the support brackets 3, which could lead to a lack of gripping force.

[0007] On the other hand, increasing the tightening torque of the pressing bolt 5 may cause deformation of the L-shaped metal fittings 2A, 2B, which may reduce the precision of the connection between the nuts 4. In this case, the insertion of the pressing bolt 5 becomes poor, weakening the pressing force, which may actually reduce the gripping force.

[0008] The present invention has been made to solve these conventional problems, and aims to solve the problem of how to more firmly fix support fittings to parapets on building roofs. [Means for solving the problem]

[0009] (1) The present invention is a support fitting that supports an object using a parapet formed on the roof of a building, a main body metal fitting formed in a tubular shape; a support member attached to the main metal fitting and supporting the object; A pair of leg fittings provided on both sides of the main fitting in the longitudinal direction and gripping the parapet; High nuts fixed to both sides of one of the leg fittings; a push bolt that screws into the high nut; and a pressure plate that presses the parapet and grips it between the legs as the press bolt is screwed into the high nut.

[0010] (2) At this time, a bolt receiving portion to which the shank of the pressing bolt is fastened is fixed to the pressing plate, The tip of the shaft of the pressing bolt is formed into an arc-shaped rounded tip, As the pressing bolt is screwed into the high nut, the tip of the shaft presses against the pressure plate, and the parapet can be gripped between the legs.

[0011] (3) In one embodiment of the present invention, The main body metal fitting is configured by connecting a plurality of tubular metal fittings in approximately parallel, the support member is configured by a support bracket that supports an antenna that constitutes the target object, The support fitting is erected on the tubular fitting arranged in the center, while the tubular fittings arranged on both sides are each formed in a tubular shape.

[0012] (4) In another aspect of the present invention, the support member includes a first pulley rotatably supported on the other leg fitting, A second pulley is rotatably supported on the side of the building, and a wire lashing a cable as the object is wound around both pulleys.

[0013] (5) In still another embodiment of the present invention, The support member is constituted by an eyebolt provided on the other leg fitting, and a wire lashing a cable is suspended from the eyebolt. [Effects of the Invention]

[0014] According to the present invention, it is possible to more firmly fix the support fittings to the parapet on the roof of a building. [Brief explanation of the drawings]

[0015] [Figure 1] FIG. 2 is a side view of the support bracket of the first embodiment. [Figure 2] Rear view of the same. [Figure 3] Same plan view. [Figure 4] (a) is a side view of one leg pipe, (b) is a rear view of the same, (c) is a side view of the other leg fitting, and (d) is a rear view of the same. [Figure 5] Side view of the push bolt [Figure 6] FIG. 10 is an enlarged side view showing the state in which the pressing bolt is screwed into the high nut to press the pressing plate. [Figure 7] FIG. 10 is a side view showing another example of an antenna. [Figure 8] FIG. 10 is a schematic diagram showing the state in which the support bracket of the second embodiment is used. [Figure 9] 9A is a side view of the support fitting 50a in FIG. 8, FIG. 9B is a plan view of the same, and FIG. 9C is a rear view of the same. [Figure 10] 9(a) is a front view of the support fitting 50b in FIG. 8, and FIG. 9(b) is a cross-sectional view showing the support fitting 50b in a fixed state. [Figure 11] 1A is a perspective view showing the support fitting of Patent Document 1, and FIG. 1B is an enlarged side view showing the state in which the pressing bolt is screwed into the connecting nut to press the pressing plate. DETAILED DESCRIPTION OF THE INVENTION

[0016] A support fitting according to an embodiment of the present invention will now be described. This support fitting is fixed by clamping it against a parapet on the roof of a building.

[0017] Here, the four sets of connected nuts in the support fittings of Patent Document 1 have been changed to high nuts, and round-tipped bolts with rounded shank tips are used for the push bolts 5. This makes it possible to fix the support fittings to the parapet P more firmly than the support fittings of Patent Document 1. [Example]

[0018] The support bracket 10 of Example 1 will be described with reference to Figures 1 to 7. The support bracket 10 of this example is used to install various objects, such as antennas, on the parapet P, and is particularly suitable for installing objects with large mass, such as antennas for 5G communication (hereinafter referred to as 5G antennas).

[0019] Specifically, as shown in Figures 1 to 3, the support bracket 10 is mainly composed of a main bracket 11, a support bracket 12 erected on the main bracket 11, a leg bracket 13 installed on the front side F of the main bracket 11, and a pair of leg brackets 14 installed on the rear side B of the main bracket 11.

[0020] <Main bracket 11, support bracket 12> (1) As shown in Figures 2 and 3, the main body fitting 11 comprises three tubular fittings (pipe-shaped fittings) 111, 112, and 113, and is configured by connecting the central tubular fitting 111 and the tubular fittings 112 and 113 on both sides in approximately parallel relation, and a fixing hole 111c for the support fitting 12 is formed on the front F side of the tubular fitting 11.

[0021] A row of communication holes 15a is formed in each of the side plates 111a, 111b, 112a, 112b, 113a, and 113b of the tubular fittings 111, 112, and 113. Two rows of communication holes 15b are formed in each of the upper and lower plates 112d, 112e, 113d, and 113e of the tubular fittings 112 and 113 on the rear F side.

[0022] Here, the tubular fittings 111, 112, 113 are connected together by inserting the shaft of a connecting bolt 16 into the communication hole 15a of the tubular fittings 111, 112, 113 and fastening a nut 17 to the shaft.

[0023] (2) As shown in Figures 1 and 3, the support bracket 12 is formed in the shape of a cylindrical pole, with a support 22 for the antenna 21a attached to the outer periphery of the upper end, and a lightning rod 21b erected on the upper end surface. Note that a top plate (lid portion, not shown) may be provided on the upper end surface without erecting the lightning rod 21b.

[0024] Meanwhile, the lower end of the support bracket 12 is inserted into a mounting hole 111c formed in an upper plate 111d of the tubular bracket 111. A connecting bolt 16 is inserted into a through-hole (not shown) formed in the lower end of this support bracket 12. A nut 17 is fastened to the shaft of this connecting bolt 16, thereby fastening the tubular brackets 111, 112, and 113 together.

[0025] <Leg brackets 13, 14> The leg fitting 13 is mainly made of a tubular pipe, with an upper end 13a fixed to the end of the tubular fitting 111 on the front F side by welding, and a lower end 13b facing downward.

[0026] 4, the leg fitting 14 is mainly composed of a tubular leg pipe 25, with a presser plate 26 having an L-shaped cross section welded to the upper end, with a through-hole 20 formed in one end 26a of the presser plate 26 and a through-hole 30 formed in the other end 26b. A roughly triangular presser plate 27 is welded to the bottom surface of the other end 26b and to the back surface of the leg pipe 25. A roughly triangular presser plate 28 is welded to the bottom surface of the other end 26b and to the inner surface of the leg pipe 25.

[0027] Here, when connecting the tubular fittings 111, 112, 113, the shanks of the connecting bolts 16, 24 are inserted into the through-holes 20, 30 and nuts 17, 23 are fastened together to fasten the leg pipe 25. At this time, the attachment position of the leg pipe 25 can be adjusted according to the width W of the parapet P by selecting the communication holes 15a, 15b.

[0028] High nuts (long nuts) 29 are fixed by welding to both sides (inner and outer surfaces) of the leg pipe 25. For example, a "H=50" nut with a total length of 50 mm is used as the high nuts 29.

[0029] Specifically, as shown in Fig. 6, the shaft 32b of the pressing bolt 32 is screwed into the high nut 29. In addition, the left and right holding plates 31 of the parapet P have bolt receiving portions (including receiving pipes) 31a welded to positions corresponding to the high nuts 29, and the tip 32a side of the shaft 32b of the pressing bolt 32 is fastened to the bolt receiving portion 31a.

[0030] Therefore, as the pressing bolt 32 is screwed into the high nut 29, both retaining plates 31 are pressed, and the parapet P is gripped (sandwiched) and fixed between both leg fittings 13, 14. At this time, as shown in Figure 5, the tip 32a of the shaft of the pressing bolt 32 is formed into an arc-shaped rounded tip to provide a friction countermeasure against the bolt receiving part 31a.

[0031] <Installation Procedure> The following describes the procedure for attaching the support fitting 10 to the parapet P. First, the tubular fittings 111, 112, and 113 are placed on the parapet P.

[0032] Next, the communicating holes 15a, 15b are selected according to the width W of the parapet P, and the leg pipe 25 is fastened together using the connecting bolts 16, 24 and nuts 17, 23. In this state, the position of the presser plate 31 is adjusted so that the tip 30a of the presser bolt 30 faces the bolt receiving portion 31a.

[0033] Thereafter, the shaft portion 32b of each pressing bolt 32 is screwed into the high nut 29, and the tip 32a side of the pressing bolt 32 is fastened to the bolt receiving portion 31a. In this state, the shaft portion 32b of the pressing bolt 32 is rotated in one direction to screw it into the high nut 29, and the shaft tip 32a of the pressing bolt 32 presses the presser plate 31 to the front side F.

[0034] As a result, the parapet P is clamped between the leg fittings 13, 14, and is gripped (sandwiched) between the leg fittings 13, 14, thereby fixing the support fitting 10 to the parapet P. This makes it possible to perform the installation work on the parapet P (especially the tightening work of the push bolts 32) from one side of the roof.

[0035] Thereafter, the lower end of the support bracket 12 is inserted into the mounting hole 111c and then fastened together using the connecting bolt 16 and nut 17, and the support bracket 12 is erected on the top plate 111d of the tubular bracket 111. After this erection, the antenna 21a and the lightning rod 21b (or the top plate if no lightning rod 21b is provided) are attached to the support bracket 12, and the work is completed.

[0036] In this case, not only the antenna 21a but also various types of antennas such as the antenna 21c in Fig. 7 can be installed on the support bracket 12. The following effects can be obtained with this support bracket 10.

[0037] (1) That is, as mentioned above, in Patent Document 1, as the tightening torque of the parapet P increases, the L-shaped metal fittings 2A, 2B deform, and the connection accuracy of each nut 4 deteriorates, which may result in a decrease in gripping force.

[0038] In contrast, the main body fitting 11 and leg fittings 13, 14 of the support fitting 10 have higher rigidity than the L-shaped fittings 2A, 2B of Patent Document 1, and are able to withstand increased tightening torque. Furthermore, because the support fitting 10 uses a high nut 29 rather than a group of four connected nuts, there is no risk of a decrease in the gripping force of the parapet P due to a deterioration in the connection accuracy.

[0039] As a result, with the support bracket 10, it is possible to increase the tightening torque of the pressing bolt 32 and improve the gripping force of both leg pipes 13, 14. Therefore, the support bracket 10 can be fixed more firmly than in Patent Document 1, and it is possible to avoid insufficient gripping force when various types of antennas are attached to the support bracket 12.

[0040] (2) The push bolt 5 of Patent Document 1 has an angular outer peripheral edge at the tip of the shaft, which increases frictional resistance against the bolt receiving portion 31a, and may have an adverse effect on the bolt axial force and reduce the tightening torque.

[0041] In contrast, the pressing bolt 32 of the support bracket 10 has an arc-shaped rounded tip 32a of the shaft, which reduces frictional resistance with the bolt receiving portion 31a and prevents a decrease in the bolt axial force, thereby improving the pressing force of the pressing bolt 32. [Example]

[0042] The support fitting of the second embodiment will be described with reference to Figures 8 to 10. Here, the same components as those of the first embodiment will be designated by the same reference numerals.

[0043] In this embodiment, as shown in Fig. 8, a pair of support brackets 50a and 50b is used to suspend and support a messenger wire 42 with a cable lashed thereto. The support bracket 50a is fixed by sandwiching the parapet P on the roof of the building 40, as in the first embodiment, while the support bracket 50b is fixed to the wall surface 40a of the building 40.

[0044] <Support bracket 50a> The support fitting 50a will be described with reference to Figure 9. This support fitting 50a is mainly composed of a main fitting 51, a leg fitting 52 installed on the front side F (front side F in the longitudinal direction) of the fitting main body 51, and a pair of leg fittings 53 installed on the rear side B (rear side B in the longitudinal direction) of the present fitting 51.

[0045] The main body metal fitting 51 is composed of a single tubular metal fitting (pipe-shaped metal fitting), and a row of communication holes 15a is formed in the left and right side plates 51a. Two rows of communication holes 15b are formed in the upper and lower plates 51b, 51c at positions corresponding to the communication holes 15a.

[0046] The leg fitting 52 has a fixed part 52a welded to the front end (end on the front side F) of the main body fitting 51, and a tubular leg pipe 52b extending downward at a 90-degree angle from the front end of the fixed part 52a. The leg pipe 52b has a pair of support plates 56 and a pulley (sheave / thimble) 59 rotatably supported between the support plates 56.

[0047] The leg fittings 53 are equipped with tubular leg pipes 54 and pressure plates 55 that intersect with the leg pipes 35 at an angle of approximately 90 degrees. A pair of L-shaped fittings 60 are bolted to the upper ends of the left and right pressure plates 55, and the L-shaped fittings 60 are connected together by bolts 61 and nuts 62.

[0048] The retainer plate 55 has a through hole 20 that communicates with the communicating hole 15a, while the lower end of the L-shaped metal fitting 60 has a through hole 63 formed at a position corresponding to the communicating hole 15b. Here, the leg pipe 54 is fixed by selecting any of the communicating holes 15a, 15b, inserting the shanks of the connecting bolts 16, 24 into the holes 15a, 15b and through holes 20, 63, and tightening the nuts 17, 23. In this case, by selecting the communicating hole 15a, 15b, the attachment position of the leg fitting 53 can be adjusted according to the width W of the parapet P.

[0049] Similar to the first embodiment, high nuts (long nuts) 29 are fixed by welding to both sides (inner and outer surfaces) of the leg pipe 54. The shafts 32b of the pressing bolts 32 are screwed into the high nuts 29. Here, a pressing plate 31 is provided for each of the left and right leg pipes 25, and a bolt receiving portion 31a is fixed at a position corresponding to the high nuts 29.

[0050] The tip 32a side of the shaft 32b of the pressing bolt 32 is fastened to this bolt receiving portion 31a, so as the shaft 32b of the pressing bolt 32 is screwed into the high nut 29, both pressure plates 31 are pressed, and the parapet P is gripped (clamped) and fixed between the two leg fittings 13, 14.

[0051] <Support bracket 50b> 10(a) and 10(b), the support fitting 50b includes a rectangular base plate 71 fixed to the wall surface 40a using anchor bolts 72, a pair of support plates 73 erected on the base plate 71, and a pulley (sheave / thimble) 74 rotatably supported on an axle bolt 75 of the support plate 73, with a pair of nuts 76 fastened to the axle bolt 75. Here, a messenger wire 42 is wound around both pulleys 59, 74, and a cable is lashed to the messenger wire 42.

[0052] <Installation Procedure> The procedure for attaching the support fittings 50a and 50b will be described below. First, the support fitting 50b is fixed to the wall surface 40a using anchor bolts 72. Then, the support fitting 50a is fixed to the parapet P according to the position of the support fitting 50b.

[0053] To explain the procedure for installing the support bracket 50a, first, place the main bracket 51 on the parapet P. Next, select the communication holes 15a, 15b according to the width W of the parapet P, and fasten the leg pipe 54 together using the connecting bolts 16, 24 and nuts 17, 23.

[0054] In this state, the position of the presser plate 31 is adjusted so that the shank tip 30a of the presser bolt 30 faces the bolt receiving portion 31a. Then, the shank 32b of each presser bolt 32 is screwed into the high nut 29 and fastened to the bolt receiving portion 31a.

[0055] In this state, if the shaft 32b of the pressing bolt 32 is rotated in one direction and screwed into the high nut 29, the shaft tip 32a of the pressing bolt 32 will press the retaining plate 31 to the front side F. As a result, the parapet P is clamped between the leg fittings 52, 53, and is gripped (sandwiched) between the leg fittings 52, 53, and the support fitting 50a is fixed to the parapet P.

[0056] Thereafter, the messenger wire 42 with the cable lashed thereto is wound around the pulleys 59 and 74, completing the work. The support fittings 50a and 50b have the following advantages.

[0057] (1) That is, the support fitting 50a uses the high nut 29 and the press bolt 32 to be fixed to the parapet P in the same manner as in the first embodiment, and therefore can be fixed to the parapet P more firmly than in Patent Document 1.

[0058] (2) Furthermore, because the cable was previously routed through a duct in Building 40, the duct had to be removed when performing maintenance and inspection of the cable, which could have made the work less efficient.

[0059] In contrast, support fittings 50a and 50b allow messenger wire 42 to be suspended without passing through a duct, improving the workability of maintenance and inspection. Also, because messenger wire 42 is wound around pulleys 59 and 74, workers can perform cable maintenance and inspection work by pulling messenger wire 42 while riding in a gondola or the like, making the work easier.

[0060] (3) Furthermore, since the support fittings 50a and 50b simply fix and attach the messenger wire 42 at the top and bottom, there is no need for metal fittings to support the wire 42 in the middle, which also makes it possible to reduce costs and improve workability.

[0061] <Test Results> The results of the bolt axial force tests are explained below. Here, the bolt axial force was measured for a set of 32 bolts and 29 high nuts, and a set of 5 press bolts and 4 groups of double nuts from Patent Document 1.

[0062] (1) In order to suspend and support the messenger wire using the support bracket 50a, a bolt axial force of 15,959 N is required.

[0063] As shown in Fig. 11(b), a bolt axial force test was conducted using a set of four groups of connected nuts (two high nuts with a height of 21 mm welded together) and a press bolt 5 according to Patent Document 1. At that time, a bolt receiving portion 6a was welded to a press plate 6.

[0064] In this case, when tightened with the desk-tested torque of 70 N·m, the bolt axial force was 10,350 N, which was insufficient. Therefore, in an attempt to improve the bolt axial force, oil was applied to press bolt 5 and it was tightened to 70 N·m, but this still decreased to 9,230 N. This is thought to be due to increased friction at the bolt tip.

[0065] In addition, in the case of a structure in which a group of four connected nuts is welded to a square pipe (leg pipe 54), it is presumed that the square pipe deforms as the tightening torque increases, making it difficult for the two nuts 4 to fit together, and causing the bolt axial force to escape.

[0066] (2) In order to solve the above-mentioned causes, the support fitting 50a takes the following measures. A: As a measure against friction at the tip of the bolt, as shown in FIG. 5, the tip 32a of the shaft of the pressing bolt 32 is formed into a rounded tip shape. B: As a measure to prevent the two nuts 4 from fitting together poorly, one high nut 29 with a height of "H=50" was welded as shown in Figure 6.

[0067] For the support bracket 50a with these measures implemented, oil was applied to the pressure bolt 32, as in Patent Document 1, and the bolt axial force was measured by tightening it to 70 N·m. The measurement result was 20,810 N, which satisfied the required bolt axial force. Note that the support bracket 10 of Example 1 also employs a configuration similar to the above measures, and is therefore similarly capable of satisfying the required bolt axial force.

[0068] Other examples The present invention is not limited to the above-described embodiment, and modifications can be made within the scope of the claims. For example, the pulley 59 and support plate 56 of Example 2 may be eliminated, and a messenger wire lashing the cable may be hung using an eyebolt.

[0069] In this case, pulley 74 of support bracket 50b can be eliminated, and the lower end of the messenger wire can be wound around the shaft of bolt 75. Also, support bracket 50b can be eliminated, and the lower end of the messenger wire can be attached to wall surface 40a using a U-shaped bracket (not shown) or the like. [Explanation of symbols]

[0070] 10, 50a, 50b...Support bracket 11,51...Main body fittings 111~113 Tubular fittings 111a, 111b, 112a, 112b, 113a, 113b, 51a・Side plate 111c Mounting hole 111d Upper Plate 112d,112e,113d,113e・Upper and lower board 12...Support bracket 13, 14, 52, 53...Leg brackets 13a, 13b...upper and lower ends 15a,15b・Communication hole 16,24 Connecting bolts 17,23 Nut 21a, 21c Antenna 21b・Lightning rod 22·Support 25,52b Leg pipe 26, 27, 31 Retaining plate 20, 30, 63 Through holes 29 High Nut 31a Bolt receiving part (including receiving pipe) 32 Push bolt 32a Tip 32b・Shaft part 40 Building 41a Wall 42 Messenger Wire 52a・Fixed part 56・Support plate 59,74 Pulley 60 L-shaped bracket 61.75 volts 62,76 Nut 71·Substrate 72 Anchor bolt

Claims

1. A support bracket that supports an object using a parapet formed on the roof of a building, a main body metal fitting formed in a tubular shape; a support member attached to the main metal fitting and supporting the object; A pair of leg fittings provided on both sides of the main fitting in the longitudinal direction and gripping the parapet; High nuts fixed to both sides of one of the leg fittings; a push bolt that screws into the high nut; A presser plate that presses the parapet and grips it between the legs as the press bolt is screwed into the high nut; A support bracket comprising:

2. A bolt receiving portion to which the shank of the pressing bolt is fastened is fixed to the pressing plate, The tip of the shaft of the pressing bolt is formed into an arc-shaped rounded tip, As the pressing bolt is screwed into the high nut, the tip of the shaft presses against the pressing plate, 2. The support bracket according to claim 1, wherein the parapet is clamped between the legs.

3. The main body metal fitting is configured by connecting a plurality of tubular metal fittings in approximately parallel, the support member is configured by a support bracket that supports an antenna that constitutes the target object, The support member is erected on the centrally disposed tubular metal fitting, 3. A support fitting according to claim 1 or 2, wherein the leg fittings formed in a tubular shape are provided on the tubular fittings arranged on both sides.

4. the support member includes a first pulley rotatably supported on the other leg fitting, a second pulley is rotatably supported on the side surface of the building; 3. A support bracket according to claim 1, wherein a wire used for lashing a cable as the object is wound around both pulleys.

5. the support member is configured by an eyebolt provided on the other leg fitting, 3. A support bracket according to claim 1, wherein a wire lashing a cable is suspended from the eye bolt.

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