JP7792640B2 - Support bracket - Google Patents

Description

The present invention relates to a support bracket that uses the parapet on the roof of a building to support an object such as an antenna or cable.

Patent Document 1 is known as a support bracket for installing antennas or other devices on rooftop parapets. Outlined based on Figure 11(a), the support bracket 1 in Patent Document 1 comprises a bracket main body 2 formed in an inverted U-shape in cross section and a support bracket 3 erected on the bracket main body 2.

This metal fitting body 2 is composed of two connected L-shaped metal fittings 2A and 2B. A pair of nuts 4 are welded to both sides of the lower end of each of these L-shaped metal fittings 2A and 2B.

Then, as shown in Figure 11(b), as the pressing bolt 5 is threaded into the group of connecting nuts 4, the retaining plate 6 tightens and grips the parapet P. This secures the support bracket 1 to the parapet, and then the antenna is attached to the support bracket 3.

Patent No. 6948823

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

On the other hand, increasing the tightening torque of the pressure bolt 5 may cause the L-shaped metal fittings 2A and 2B to deform, resulting in a decrease in the accuracy of the connection between the nuts 4. In this case, the pressure bolt 5 will not fit properly, weakening the pressing force and potentially reducing the gripping force.

The present invention was made to solve these conventional problems, and its objective is to more firmly secure support fittings to the parapet on the roof of a building.

(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.

(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.

(3) In one aspect 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.

(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.

(5) In still another aspect 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.

This invention makes it possible to more firmly secure support fittings to the parapet on the roof of a building.

FIG. 3 is a side view of the support bracket of the first embodiment. Rear view of the same. Same plan view. (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. Side view of the push bolt 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. FIG. 10 is a side view showing another example of an antenna. FIG. 10 is a schematic diagram showing the state in which the support bracket of the second embodiment is used. 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. 9A is a front view of the support fitting 50b in FIG. 8, and FIG. 9B is a cross-sectional view showing the support fitting 50b in a fixed state. 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 a press bolt is screwed into the same connecting nut to press the pressure plate.

The following describes a support bracket according to an embodiment of the present invention. This support bracket is fixed by clamping it against the parapet on the roof of a building.

Here, the four 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 even more firmly than in Patent Document 1.

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 large objects, such as 5G communication antennas (hereinafter referred to as 5G antennas).

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.

<Main body metal fitting 11, support metal fitting 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 side F of the tubular fitting 11.

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. Furthermore, two rows of communication holes 15b are formed on the rear F side of each of the upper and lower plates 112d, 112e, 113d, and 113e of the tubular fittings 112 and 113.

Here, the tubular fittings 111, 112, and 113 are connected by inserting the shank of a connecting bolt 16 into the communicating hole 15a of the tubular fittings 111, 112, and 113 and tightening a nut 17 to the shank.

(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. It is also possible to provide a top plate (lid portion, not shown) on the upper end surface without erecting the lightning rod 21b.

Meanwhile, the lower end of the support bracket 12 is inserted into a mounting hole 111c formed in the 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 it together with the tubular brackets 111, 112, and 113.

<Leg fittings 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.

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

When connecting the tubular fittings 111, 112, and 113, the shanks of the connecting bolts 16 and 24 are inserted into the through-holes 20 and 30, and the nuts 17 and 23 are tightened to fasten the leg pipes 25 together. By selecting the connecting holes 15a and 15b, the attachment position of the leg pipes 25 can be adjusted according to the width W of the parapet P.

High nuts (long nuts) 29 are welded 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 this high nut 29.

Specifically, as shown in Figure 6, the shaft 32b of the pressing bolt 32 is threaded into the high nut 29. Furthermore, bolt receiving portions (including receiving pipes) 31a are welded to the left and right retaining plates 31 of the parapet P at positions corresponding to the high nut 29, and the tip 32a of the shaft 32b of the pressing bolt 32 is fastened to the bolt receiving portion 31a.

As the pressure bolt 32 is threaded into the high nut 29, both retaining plates 31 are pressed, and the parapet P is gripped (sandwiched) and fixed between the leg fittings 13, 14. At this time, as shown in Figure 5, the tip 32a of the shaft of the pressure bolt 32 is formed into an arc-shaped rounded tip to prevent friction with the bolt receiving portion 31a.

<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.

Next, select the connecting holes 15a and 15b according to the width W of the parapet P, and fasten the leg pipe 25 together using the connecting bolts 16 and 24 and nuts 17 and 23. In this state, adjust the position of the pressure plate 31 so that the tip 30a of the pressure bolt 30 faces the bolt receiving portion 31a.

Then, the shaft 32b of each pressing bolt 32 is threaded into the high nut 29, and the tip 32a is fastened to the bolt receiving portion 31a. In this state, the shaft 32b of the pressing bolt 32 is rotated in one direction to thread it into the high nut 29, and the shaft tip 32a of the pressing bolt 32 presses the pressure plate 31 toward the front side F.

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

Then, insert the lower end of the support bracket 12 into the mounting hole 111c and fasten them together using the connecting bolt 16 and nut 17, erecting the support bracket 12 on the top plate 111d of the tubular bracket 111. After this erection, attach the antenna 21a and lightning rod 21b (or the top plate if no lightning rod 21b is provided) to the support bracket 12, completing the work.

In this case, the support bracket 12 can accommodate not only antenna 21a, but also various types of antennas, such as antenna 21c in Figure 7. Using this type of support bracket 10, the following effects can be obtained.

(1) In other words, as mentioned above, in Patent Document 1, as the tightening torque of the parapet P increases, the L-shaped metal fittings 2A and 2B may deform, deteriorating the connection accuracy of each nut 4 and reducing the gripping force.

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.

As a result, the support bracket 10 can increase the tightening torque of the pressure bolt 32 and strengthen 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.

(2) The push bolt 5 in Patent Document 1 has a squared outer edge at the tip of the shank, which increases frictional resistance against the bolt receiving portion 31a, potentially adversely affecting the bolt axial force and reducing the tightening torque.

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.

The support bracket of Example 2 will be described with reference to Figures 8 to 10. Here, the same reference numerals are used for components similar to those of Example 1.

In this embodiment, as shown in Figure 8, a pair of support brackets 50a, 50b are used to suspend a messenger wire 42 lashing the cable. Similar to the first embodiment, the support bracket 50a is secured to the parapet P on the roof of the building 40 by sandwiching it between them, while the support bracket 50b is secured to the wall 40a of the building 40.

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

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 this communication hole 15a.

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

The leg fittings 53 comprise tubular leg pipes 54 and pressure plates 55 that intersect with the leg pipes 35 at approximately a 90-degree angle. 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.

The retainer plate 55 has a through hole 20 that communicates with the communication hole 15a, while the lower end of the L-shaped bracket 60 has a through hole 63 at a position corresponding to the communication hole 15b. The leg pipe 54 is fixed by selecting any of the communication 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. By selecting the communication hole 15a, 15b, the mounting position of the leg bracket 53 can be adjusted according to the width W of the parapet P.

Long nuts 29 are welded to both sides (inner and outer surfaces) of the leg pipe 54, as in Example 1. The shaft 32b of the pressing bolt 32 is threaded into these nuts 29. Here, a retaining plate 31 is provided for each of the left and right leg pipes 25, and the bolt receiving portion 31a is fixed at a position corresponding to the high nuts 29.

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

<Support bracket 50b>
10(a) and 10(b), the support fitting 50b comprises a rectangular base plate 71 fixed to the wall surface 40a using anchor bolts 72, a pair of support plates 73 standing 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 and 74, and a cable is lashed to the messenger wire 42.

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

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

In this state, adjust the position of the retainer plate 31 so that the shank tip 30a of the pressing bolt 30 faces the bolt receiving portion 31a. Then, thread the shank 32b of each pressing bolt 32 into the high nut 29 and tighten it to the bolt receiving portion 31a.

In this state, if the shaft 32b of the pressing bolt 32 is rotated in one direction and threaded into the high nut 29, the shaft tip 32a of the pressing bolt 32 will press the retaining plate 31 toward the front F. This tightens the parapet P between the leg fittings 52, 53, and the support fitting 50a is clamped (sandwiched) between the leg fittings 52, 53, securing the parapet P.

Then, the messenger wire 42 with the cable lashed is wound around the pulleys 59 and 74, completing the work. These support brackets 50a and 50b provide the following benefits:

(1) In other words, the support bracket 50a is fixed to the parapet P using the high nut 29 and the push bolt 32, as in Example 1, and therefore can be fixed to the parapet P more firmly than in Patent Document 1.

(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 adversely affected workability.

In contrast, support brackets 50a and 50b allow the messenger wire 42 to be suspended without passing through a duct, improving the ease of maintenance and inspection work. Furthermore, because the messenger wire 42 is wound around pulleys 59 and 74, workers can easily perform cable maintenance and inspection work by pulling the messenger wire 42 while remaining aboard a gondola, etc., making the work easier.

(3) Furthermore, with the support brackets 50a and 50b, the messenger wire 42 is simply fixed and attached at the top and bottom, eliminating the need for metal fittings to support the wire 42 in the middle, which also helps reduce costs and improve workability.

<Test Results>
The results of the bolt axial force test are described below. Here, the bolt axial force was measured for a set of bolt 32 and high nut 29 and a set of press bolt 5 and four connected nuts of Patent Document 1.

(1) A bolt axial force of 15,959 N is required to suspend the messenger wire using the support bracket 50a.

As shown in Figure 11(b), the bolt axial force was tested using a set of four connected nuts (two high nuts with a height of 21 mm welded together) and a press bolt 5 as described in Patent Document 1. At that time, the bolt receiving portion 6a was welded to the press plate 6.

In this case, when tightened to the theoretical torque of 70 N·m, the bolt axial force was insufficient at 10,350 N. Therefore, in an attempt to improve the bolt axial force, oil was applied to the pressure 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.

In addition, in a structure where a group of four connected nuts is welded to a square pipe (leg pipe 54), an increase in tightening torque can cause the square pipe to deform, making it difficult for the two nuts 4 to fit together, which is thought to be another cause of the loss of bolt axial force.

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

For the support bracket 50a equipped with these measures, 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 similar configuration to the above measures, and is therefore similarly capable of satisfying the required bolt axial force.

<Others/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 the second embodiment may be eliminated, and a messenger wire lashing a cable may be suspended using an eyebolt.

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

10, 50a, 50b... Support fittings 11, 51... Main body fittings 111 to 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 plates 12... Support fittings 13, 14, 52, 53... Leg fittings 13a, 13b... Upper and lower ends 15a, 15b. Communication holes 16, 24. Connecting bolts 17, 23. Nuts 21a, 21c. Antenna 21b. Lightning rod 22. Support 25, 52b. Leg pipes 26, 27, 31. Pressing plates 20, 30, 63. Through holes 29. High nuts 31a: Bolt receiving part (including receiving pipe)
32. Push bolt 32a. Tip 32b. Shank 40. Building 41a. Wall 42. Messenger wire 52a. Fixed part 56. Support plate 59, 74. Pulley 60. L-shaped bracket 61, 75. Bolt 62, 76. Nut 71. Base plate 72. Anchor bolt

Claims (5)

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: 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. 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. 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. 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.