JPS627360B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to an improvement in a bearing plate that is fixed to an exposed portion of a rock bolt fixed to a ground such as bedrock or earth and sand to prevent deformation or collapse of the ground.

Conventionally, a metal plate such as a steel plate has been used as this type of bearing plate, but this plate is heavy and there is a limit to its size from the viewpoint of transportation and installation workability. It is difficult to support a large area of ground with a single bolt, and as a result, a large number of bolts must be installed, resulting in disadvantages such as a long installation time.

The present invention eliminates the drawbacks of the conventional bearing plate, and aims to be lightweight, easy to transport and install,
To provide a new bearing plate that exhibits sufficient strength as a bearing plate for reinforced concrete and reduces the overall cost.

That is, the present invention extends a plurality of radial reinforcing bars radially from the outer periphery of both ends of a lock bolt penetration pipe, and connects adjacent members of these radial reinforcing bars with connecting reinforcing bars to form a three-dimensional truss. This is a bearing plate that is characterized by:

Hereinafter, one embodiment of the bearing plate of the present invention will be described with reference to the drawings.

In FIGS. 1 to 3, numeral 1 is a lock bolt penetration pipe whose length is approximately equal to the thickness of the intended bearing plate. Six first radial reinforcing bars 2 are integrally attached to the outer periphery of the lower end of the pipe 1 and extend in the radial direction. The tips 2a of adjacent first radial reinforcing bars 2 are connected to each other by a first connecting reinforcing bar 3.

Furthermore, six second radial reinforcing bars 4 are integrally attached to the outer peripheral portion of the upper end of the pipe 1 and extend in the radial direction. As is clear from FIG. 2, the second radial reinforcing bars 4 extend in a direction that substantially bisects the angle between the adjacent first radial reinforcing bars 2, and are shorter than the first radial reinforcing bars. 5 is the second
It is a connecting reinforcing bar, and the distal end portion 2a of the first radial reinforcing bar 2 and the distal end portion 4a of the second radial reinforcing bar 4 are successively connected to form a truss together with the first reinforcing bar 3. Reference numeral 6 denotes a third connecting reinforcing bar, which sequentially connects the substantially middle part of the first radial reinforcing bar 2 and the tip end 4a of the second radial reinforcing bar 4 to form a truss, and the first and second connecting reinforcing bars Together with 3 and 5, it constitutes a three-dimensional truss.

Figure 4 shows an example of the construction of the three-dimensional truss type bearing plate constructed as described above on a ground surface, in which a pipe 1 is attached to the exposed part of the rock bolt 7 fixed in the ground.
Insert and secure with the tightening nut. In this state, the first radial reinforcing bars 1, first connecting reinforcing bars 3, etc. of the plate directly press against the ground surface to suppress it. Next, the concrete mortar 9 is sprayed and hardened to complete a plate that has sufficient strength and is in close contact with the ground surface.

In addition, especially if the ground surface is likely to collapse during construction, it is recommended to sandwich punching metal or wire mesh between the ground surface, attach the plate, and spray mortar over it. .

In the above embodiment, each of the first and second radial reinforcing bars is composed of six pieces, but the present invention is not limited to the above embodiment, and as long as the strength can be maintained sufficiently, it is possible to The smaller and thinner the better.

As described above, the bearing plate of the present invention has the following features:
Because it is a three-dimensional truss structure made of reinforcing bars, it is lightweight and easy to transport and install, which not only reduces overall costs, but also has the effect of being able to demonstrate sufficient strength as a bearing plate for reinforced concrete by spraying mortar.

[Brief explanation of the drawing]

FIG. 1 is a perspective view showing an embodiment of the truss type pairing plate of the present invention, FIG. 2 is a plan view thereof,
FIG. 3 is a side view, and FIG. 4 is a sectional view showing the state of construction on the ground surface. DESCRIPTION OF SYMBOLS 1... Lock bolt penetration pipe, 2... First radial reinforcing bar, 2a... Tip part, 3... First connecting reinforcing bar, 4... Second radial reinforcing bar, 4a... Tip part, 5... Second connecting reinforcing bar,
6... Third connecting reinforcing bar, 7... Lock bolt, 8... Tightening nut, 9... Concrete mortar.

Claims (1)

[Claims] 1 A plurality of radial reinforcing bars are extended radially from the outer periphery of both ends of the lock bolt penetration pipe, and adjacent members of these radial reinforcing bars are connected with connecting reinforcing bars to form a three-dimensional truss. Features a bearing plate.