JPH0489922A - Pressure supporting plate for slope reinforcement - Google Patents

Abstract

PURPOSE:To perform fitting-in of a pressure bearing plate simply by forming the plate with a front face in trapezoidal form, a trapezoidal rear face narrower than the front face in a form similar to it, and side faces consisting of a tapered portion and a vertical portion, and providing a through hole extending from the front face to the rear farce. CONSTITUTION:A trapezoidal front face 2, a rear face 3 narrower than it in a form similar thereto, and four side faces 4 consisting of tapered portion 4a and vertical portion 4b. A through hole 5 is formed extending from the front face 2 to rear face 3, and thus a pressure bearing plate 1 for reinforcement of slope is accomplished. After excavation of the ground, this pressure bearing plate 1 is installed, and backfill is made to a scaffold for driving an anchor, and boring is conducted by a boring machine. Anchor 1 is driven through the through hole 5 in the plate 1, and then the backfill material is removed. Thus, an anchor head is formed.

Description

[Detailed description of the invention] [Industrial application field] The present invention relates to a bearing plate for reinforcing slope surfaces.

[Prior Art] When excavating extremely soft ground that has fracture zones or is made of sandy soil with viscosity and underground water flow, it will collapse if excavated 2 to 3 meters and left unattended. Traditionally, Yamadome is performed in advance. However, due to the presence of boulders and hard rock layers, it may be difficult to drive mountain retaining piles (sheet piles, H piles, underground walls, etc.).

In such cases, the following construction methods are recommended. That is, the ground is excavated, the anchor head is installed, the anchor is driven and settled, and after the anchor head is formed,
Perform the next stage of excavation.

This construction method uses cross-shaped or rectangular bearing plates as shown in Figures 22-25.

[Problems to be Solved by the Invention] However, covering the excavation face metal with this anchor head is disadvantageous in terms of both workability and economy. Therefore, it is preferable to install anchor heads at a certain interval and fit a plate or top plate made of concrete or steel between them, or to spray concrete to suppress collapse in the middle.

In this case, fitting the plate will naturally be done after the anchor head is installed, but if you use a bearing plate like the one above,
There is a risk that the plates will not fit properly or the sprayed concrete will fall off. The present invention
It is an object of the present invention to provide a bearing plate for slope reinforcement that does not have such drawbacks.

Another object of the present invention is to provide a bearing plate for reinforcing a slope surface that is easy to construct when it is desired to form a continuous wall by installing each anchor head in close contact with each other so as to cover the slope surface.

[Means for solving the problem] The bearing plate for slope reinforcement is plate-shaped and has a front surface, a back surface, four side surfaces, and a through hole.The front surface is trapezoidal and the back surface is in contact with the ground. The surface is almost similar to the front surface, narrower than the front surface, and at least the left and right sides consist of a tapered part and a vertical part, the through hole is for passing the anchor, and each side connects the corresponding sides of the front and back surfaces. However, each vertical portion intersects perpendicularly with the front surface, each tapered portion intersects with the back surface at an angle, and the through hole is bored from the front surface to the back surface.

[Operation] After digging into the ground, check the height at which it will not collapse immediately, and excavate at that height. Immediately after the excavation, a bearing plate for slope reinforcement is installed, the ground is backfilled to the anchoring scaffolding, and the anchor is set to form the anchor head.

When anchor heads are formed with a spacing of 1.5 mm, collapse of the intermediate portion can be suppressed by fitting a plate or top plate made of concrete or steel between the anchor heads, or by spraying concrete.

When the anchor heads are installed closely together, a continuous wall is formed by injecting mortar or the like into the space formed by the tapered part of the bearing plate and the slope.

[Example 1] In FIGS. 1 to 3, a bearing plate 1 for reinforcing a slope is in the form of a plate made of precast concrete, and has a front surface 2, a back surface 3, four side surfaces 4, and a through hole 5.

The front surface 2 is trapezoidal, the back surface 3 is a surface for contacting the ground, is almost similar to the front surface 2, and is narrower than the front surface 2, each side surface 4 consists of a tapered part 4a and a vertical part 4b, and the through hole 5 is a surface for anchoring. It is for passing through. In the illustrated example, the tapered portion 4a and the vertical portion 4b are formed on each of the upper and lower, left and right side surfaces, but the vertical portion may only be formed on the upper and lower side surfaces.

Each side surface 4 connects corresponding sides of the front surface 2 and the back surface 3, each vertical part 4b intersects with the front surface 2 perpendicularly, each tapered part 4a intersects with the back surface 3 at an angle, and the through hole 5 is formed on the front surface 2 and the back surface. The frontage is approximately in the center of 3.

Check the height H of the ground X so that it will not collapse immediately after excavation (Fig. 4), and excavate at that height H (Fig. 5). After excavation,
Immediately install the bearing plate 1 for reinforcing the slope (Fig. 6), backfill to the anchor placement scaffold again (Fig. 7-), use the boring machine 10 to drill a hole (Fig. 8), and place the anchor 11. (Fig. 9), and the backfilling material 12 is removed (Fig. 10). After installing the anchor heads 16 at intervals as shown in step 2, next, between the anchor heads 16,
Intermediate collapse is suppressed by fitting a plate 13 or a top plate made of concrete or steel (Figs. 11 to 13) or by spraying concrete.

Furthermore, the next stage of excavation is performed (FIG. 14), and an anchor head is formed using the same method.

If the bearing plate l is made into a trapezoid as in the present invention, there will be two stages, three stages...
・Construction progressed, and even under the situation shown in Figure 21,
Play) 13 is easy to fit.

As shown in FIG. 15, if the plate 13 inserted between the bearing plates 1 is made into a trapezoid, the surfaces 22 of the plates 13 will be aligned (first
Figure 6〉, convenient. However, there are construction errors, so there is a drawback that there is a lot of adjustment (cutting to match the dimensions).

On the other hand, if the plate 13 is made rectangular as shown in Fig. 17, the plates 13 are set at an angle between the bearing plates (Fig. 18), and if the space between them is filled with earth and sand, a greening wall is created. I can do it.

In addition, as shown in FIGS. 19 and 20, the anchor head 1
6 may cover the slope. As mentioned above, this is disadvantageous in terms of workability and economy, but it is possible to form a strong continuous wall. By injecting mortar or the like into the gap 15 formed by the tapered portion 4a and the slope X, a continuous wall can be constructed more easily than a cross-shaped or rectangular bearing plate.

[Effects of the invention] According to the present invention, the plates can be easily fitted and there is no fear of them falling off, so slope reinforcement can be achieved economically, and by selecting the shape of the plates, it is easy to form a greening wall. It is possible to easily construct continuous walls.

[Brief explanation of drawings]

Figure 1 is a front view of the bearing plate for slope reinforcement, Figure 2 is a side view of the same, Figure 3 is a rear view of the same, Figures 4 to 14 are schematic illustrations of an example of the construction process, and Figures 4 to 11 are The figure is a sectional view as seen from the side, Figure 12 is a view taken from the direction of arrow in Figure 11, Figure 13 is a plan view, Figure 14 is a side view, Figure 15 is a front view, and Figure 16 is the same view. 17 is a front view, FIG. 18 is a side view, FIG. 19 is a side view, FIG. 20 is a view taken in the direction of arrow B, and FIG.
The figure is a front view, Figure 22 is a front view of the cross-shaped bearing plate, and Figure 23 is a front view of the cross-shaped bearing plate.
The figure is the same side view, Figure 24 is a front view of the rectangular bearing plate, and Figure 25 is the front view of the rectangular bearing plate.
The figure is a side view of the same. DESCRIPTION OF SYMBOLS 1... Bearing plate for slope reinforcement, 2... Front surface, 3... Back surface, 4... Side surface, 4a... Taper part, 4b...
Vertical part, 5... Through hole, 10... Boring machine,
11... Anchor 12... Backfilling material, 13.
...Plate, 15...Space, 16...Anchor head.

Claims (1)

[Claims] It is plate-shaped and has a front surface (2), a back surface (3), and four side surfaces (
4) and a through hole (5), the front surface (2) is trapezoidal, and the back surface (3) is a surface for contacting the ground (X), which is almost similar to the front surface, narrower than the front surface, and at least on the left and right sides. The side surface of has a tapered part (4_a) and a vertical part (
4_b), the through hole (5) is for passing the anchor (11), each side (4) connects the corresponding sides of the front and back sides, and each vertical part (4_b) is perpendicular to the surface. intersection, each taper part (4_
A) is a bearing pressure plate (1) for reinforcing a slope surface that intersects with the back surface at an angle, and a through hole (5) is bored from the front surface to the back surface.