JPH0214264Y2 - - Google Patents

Description

[Detailed Description of the Invention] [Industrial Application Field] This invention relates to a support device used when laying power cables, for example, and particularly to a support device made of FRP (fiber-reinforced plastic).

[Conventional technology]

When laying power cables underground, a concrete underground passage called a tunnel is provided, and a support device is attached to the side wall of the tunnel, and the power cable is supported by an arm of the supporting device.

The most commonly used support devices for the above are galvanized angle steel,
It is constructed from stainless steel angles.

However, since such metal materials have problems such as the generation of rust, materials made of fiber-reinforced plastics, that is, FRP, have also appeared. This known FRP product has a horizontal shelf on the upper edge of a plate-like arm, has an inverted L-shaped cross section, and has a metal support device and almost no shape. It doesn't change, only the material changes.

Furthermore, as an improved version of such a support made of FRP, one described in Japanese Patent Publication No. 59-48752 has also appeared.

The one described in the above publication has a horizontal shelf on the upper edge of the plate-like arm, a low rib on the lower edge, and a U-shaped cross section, and is fixed to the support at the base of this arm. The upper and lower bolts are passed through the upper and lower bolt insertion holes provided here, and the upper and lower bolts are inserted into the bolt insertion holes of the support column and tightened with nuts.

[Problem that the invention attempts to solve]

The support device described in the above-mentioned publication has no risk of rust compared to a metal one, has ribs on the lower edge, and has a thick base. Although it is superior in strength to the previous FRP support device, there is a problem that the arm tends to tilt downward due to the difference in dimensions between the mounting bolt and the bolt insertion hole in the fixed part of the arm and column. Furthermore, since the elastic modulus is lower than that of steel, the arm lacks rigidity when an external force is applied to the arm in the lateral direction, and there is a risk of breakage at the bolt insertion hole.

[Means for solving problems]

In order to solve the above problems, this idea consists of an FRP column with a hollow rectangular cross section that is fixed to the side wall of the tunnel, and a pair of left and right columns with a base at the rear end that sandwiches the column from both sides. The arms are made of FRP, and each arm has an inward U-shape with its cross section facing each other so as to form a box structure with a cross-sectional opening. A vertical projection and a vertical recess are provided to engage, and the support and base are provided above the center of the engaging portion between the projection and the recess, with the support being sandwiched between the bases of both arms. It is fixed with an arm mounting bolt inserted through the insertion hole, and the left and right arms are joined together by a coupling bolt inserted through the insertion hole provided in both arms.

[Effect]

This device has the above-mentioned structure, and the two sides of the column are sandwiched between the bases of the separated left and right arms, and the vertical protrusions on the inside of both bases are engaged with the vertical recesses provided on the column. The support and the arm are connected by an arm mounting bolt inserted through the insertion hole provided at the center of the engagement part between the protrusion of the base and the recess of the support, and the right and left connections are connected by the connection bolt inserted into the insertion hole provided in the arm. It connects the arms.

〔Example〕

In the figure, 1 is a hollow rectangular FRP support.
On both sides thereof, longitudinally grooved recesses 2 having a trapezoidal cross section are formed in the longitudinal direction. In addition, a plurality of insertion holes through which arm mounting bolts 3 are inserted are formed in the bottom of the recess 2 at predetermined intervals in this support 1, and anchor bolts 4 for fixing this support 1 to a wall surface etc. are inserted. A plurality of holes are formed in front and back at appropriate intervals.

Reference numeral 5 denotes a pair of left and right arms made of FRP, the cross sections of which are oppositely U-shaped, and their bases 6 expand downward to sandwich both sides of the support column 1.

Further, the tips of the left and right arms 5 are closed, and the rear ends of the left and right bases 6 are open, and a trapezoidal longitudinal protrusion 7 that engages with the recess 2 of the support column 1 is formed on the inner surface of the base 6.

Near the tip and near the base of the arm 5 are formed insertion holes for coupling bolts 8 for coupling the left and right arms 5, and in the protrusion 7 of the base 6 are a plurality of insertion holes through which the arm mounting bolts 3 are inserted. form a pore.

A rib 9 is provided on the outer side of the upper end of the base 6, and the arm 5
As shown in FIG. 2, a rib 10 is provided on the inner side of the base near the base.

Reference numeral 11 in FIG. 4 is a concrete tunnel built underground, and support columns 1 are arranged and fixed at appropriate intervals on the inner surface of the side wall 12 of the tunnel 11 using anchor bolts 4.

In this way, the column 1 is sandwiched between the bases 6 of the left and right arms 5 via the anchor bolts 4 fixed to the side wall 12, and the protrusion 7 on the inside thereof is engaged with the recess 2 of the column 1. Next, insert the bolts 8 into the insertion holes of the left and right arms 5.
, and tighten the left and right arms 5 using nuts, spring washers, etc., and fix the base 6 to the support 1 using a plurality of bolts 3 inserted through the insertion holes of the base 6 and support 1, and spring washers, nuts, etc. do.

After the arm 5 is fixed to the support column 1 in this manner, the power cable 14 is placed on the arm 5 via the cable holder 13 and fixed by the presser frame 15 as shown in FIG.

However, if there is one support on the wall other than the tunnel mentioned above,
Of course, it can also be used to support cables by attaching them, or to support small diameter pipes instead of cables. In addition, the recess 2 of the support column 1
may be replaced with a protrusion, and the protrusion 7 inside the base 6 may be replaced with a recess.

〔effect〕

The arm of this invention consists of a pair of left and right arms, and as mentioned above, the cross section is U-shaped, facing each other.
These two parts are integrated with a connecting bolt, resulting in a box structure with a cross-sectional opening. For this reason, the material
Although FRP is inferior to steel in terms of rigidity, it can still provide the required strength and rigidity, making it extremely durable, especially in the lateral direction.

Furthermore, since the support is fixed by sandwiching the support between the bases of the pair of left and right arms, attachment to the support is easy and the rigidity in the lateral (left and right) direction is improved.

The support column and the base of the arm are not simply fixed with bolts, but also have a vertical concave part and a vertical protrusion that engage each other, and a plurality of bolts that are inserted into the insertion hole provided at the center of this engaging part. Since it is fixed with individual fixing bolts, the concave portion and the protrusion are in full contact with each other, resulting in an even stronger connection. As a result, the engaging part between the protrusion and the recess receives the downward force due to the weight of the cable, etc. applied to the arm, which reduces the burden on the fixing bolt and eliminates play caused by the dimensional difference between the bolt insertion hole and the bolt outer diameter. In addition, the fixing bolt functions to prevent the arm from rotating relative to the column, and the arm and column are firmly integrated. Furthermore, since the rear side of the arm does not protrude from the support, the support can be fixed to the side wall of the tunnel, and the support supporting the arm can be firmly supported by the side wall of the tunnel.

[Brief explanation of the drawing]

Fig. 1 is a front view showing an example of the support device of this invention, Fig. 2 is a cross-sectional plan view of the same as above, Fig. 3 is a perspective view of the same, and Fig. 4 is a tunnel view showing an example of the installation state of the support device. FIG. 1... Support column, 2... Recess, 3, 8... Bolt,
5...Arm, 6...Base, 7...Protrusion.

Claims (1)

[Scope of utility model registration request] It consists of an FRP column with a hollow rectangular cross section that is fixed to the side wall of the tunnel, and a pair of left and right FRP arms with bases formed at the rear ends that sandwich this column from both sides. In order to obtain a mouth-shaped box structure, its cross section is formed into an inward U-shape facing each other, and on the inside of the base and on both sides of the support there are longitudinal protrusions that engage with each other, and longitudinal protrusions that engage with each other. A recess is provided, and the support is sandwiched between the bases of both arms, and the support and the base are fixed with an arm mounting bolt inserted through an insertion hole provided at the center of the engaging portion between the protrusion and the recess. , a support device for power cables, etc., in which the left and right arms are joined together by a joining bolt inserted through the insertion hole provided in both arms.