JPS6257764B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a soil slope stabilization method, and more particularly to a slope stabilization method using an anchor rod having a slitted steel pipe at the upper end.

[Prior art]

The present inventor previously proposed in Japanese Patent Application No. 55-46407 that the tension applied to the hair by hairpins or combs works most effectively when the hair gets caught between the teeth of the hairpins or combs, and the hair style etc. Focusing on the phenomenon of stabilization, we proposed a construction method that can reliably stabilize slopes.

However, in this construction method, the upper ends of the anchor rods have a circular cross section, so even if the anchor rods were tightened together, the soil between them would escape along the circular cross section, and a sufficient consolidation effect could not be achieved.

In addition, even if the anchor rods are connected in a tightened state, the anchor rods themselves do not change, so it is not possible to pull and tighten all of the anchor rods installed on the slope, and slope collapse can only be prevented partially. I couldn't do it.

[Purpose of the invention]

The present invention aims to solve these drawbacks of the prior art, and it is possible to form a sufficient soil compaction surface on the upper end surface of the anchor rod, thereby obtaining a strong consolidation effect, and furthermore, it is possible to form a sufficient compaction surface on the upper end surface of the anchor rod. To provide a method for stabilizing a slope by covering all of the installed anchor rods in a tight state and in a steel pattern, thereby integrating the entire underground part where the anchor rods are installed and sufficiently resisting slope collapse. The purpose is to

[Structure of the invention]

In order to achieve the above object, in the present invention, the upper end of each anchor rod is made of a steel pipe, and a plurality of arcuate earth pressure plates are formed by making vertical slits in the steel pipe, and each pressure earth plate is connected to the earth pressure plate. The structure is such that it is tightly connected to the compacted earth plate of the anchor rod using a connecting tool, and all the compacted earth plates are expanded radially to achieve a consolidation effect.

〔Example〕

Hereinafter, the present invention will be specifically explained based on an embodiment shown in the accompanying drawings.

FIG. 1 shows a constructed ground 2 having a soil slope 1, and numeral 3 in the figure is a slip surface where the soil mass 4 may collapse.

In the above-mentioned prepared ground 2, the anchor rod 5 according to the present invention is driven into the soil slope 1 so as to be orthogonal to the above-mentioned sliding surface 3. Further, the anchor rod 5 is connected at its ground surface end with a connecting device 6 such as a turnbuckle in a tensioned state.

2 to 4 show the detailed structure of the anchor rod 5 according to the present invention, and as shown,
Anchor rod 5 is attached to its upper end (e.g. from 0.5m
1m) is made of steel pipe 7. Each steel pipe 7 has a plurality of vertically elongated slits 8 bored therein at a required circumferential pitch, and this is to form an arcuate compacted earth plate 9 between the longitudinally long slits 8,8. As shown in FIG. 4, each arc-shaped pressed earth plate 9 has a connecting hole 10, and one end of the connecting tool 6 is connected to this connecting hole 10, and when tension is generated, the arc-shaped pressed earth plate 9
are expanded as shown in FIGS. 2 and 3. For example, in FIG. 3, each arcuate compacted earth plate 9 can propagate the compaction force over a wide area shown by diagonal lines.

FIGS. 5, 6, and 7 show examples of connecting the anchor rods 8 on inclined surfaces. FIG. 5 shows five anchor rods 5 connected radially, and FIG. 5 are connected radially.

FIG. 7 shows a case in which a large number of anchor rods 5 arranged in a lattice pattern are all connected, thereby attempting to integrate the entire underground part in which all the anchor rods 5 are driven.

In this configuration, it is now assumed that the earth clod 4 is about to collapse downward along the sliding surface 3. In this case, first, the anchor rods 5, 5 are tightly connected by the connector 6, so that
The part near the surface of the soil slope 1 is consolidated,
This can prevent the same part from collapsing. Moreover, since the anchor rod 5 according to the present invention has the arcuate pressed earth plate 9 which expands radially at its upper end, the pressing force is propagated by the expansion as shown in FIG. It is possible to improve the compaction effect and completely prevent the collapse described above. In addition, the load of the earth clod 4 acts on the point that intersects with the axis of the anchor rod 5, causing a bending moment and shearing force on the anchor rod 5, but by ensuring sufficient strength of the anchor rod 5, slipping of the earth clod 4 can be completely prevented. can.

8 and 9 show a modified example of the anchor rod 5 of the present invention, which is a steel pipe 7.
Fix the split nut 11 inside the split nut 11.
It is constructed by screwing a tapered bolt 12 into the. In other words, such a tapered bolt 12
By screwing them together, each arcuate compacted earth plate 9 expands radially, and the same compaction effect as described above can be achieved.

〔Effect of the invention〕

As described above, in the method for stabilizing slopes using anchor rods according to the present invention, the ground surface end of the anchor rod can be expanded radially, so the pressure propagation area can be increased and a sufficient consolidation effect can be achieved. Furthermore, since all anchor rods can be connected, slope collapse can be effectively prevented.

[Brief explanation of the drawing]

Fig. 1 is an explanatory diagram of the slope stabilization method using the anchor rod according to the present invention, Fig. 2 is an enlarged explanatory diagram of the same anchor rod, Fig. 3 is a directional view taken along the line shown in Fig. 2, and Fig. 4 is an illustration of the steel pipe section. Perspective view, Figures 5 and 6
7 and 7 are explanatory diagrams of a connected state of the anchor rod, FIG. 8 is a sectional partial front view of a modified example of the anchor rod, and FIG. 9 is a sectional view taken along the line of FIG. 8. In the figure, 1...Soil slope, 2...Made ground, 3...Slip surface, 4...Earth clod, 5...Anchor rod, 6...Connector, 7...Steel pipe, 8...Vertical slit, 9...Segmental compacted earth plate, 10... Connection hole, 11... Split nut, 1
2...Tapered bolt.

Claims (1)

[Claims] 1. A plurality of anchor rods are driven regularly or irregularly into a soil slope, the upper end of each anchor rod is formed of a steel pipe, and a plurality of longitudinal slits are formed in the steel pipe at circumferential pitches. , and connect the arc-shaped soil plate formed between the longitudinal slits with the arc-shaped soil plate provided at the upper end of another anchor rod connected to the same anchor rod in a tightened state using a connecting tool,
A slope stabilization method characterized by bringing the slope into a consolidated state by expanding the arcuate compacted earth plate in the radial direction. 2 The upper end is formed of a steel pipe, a plurality of vertically elongated slits are bored in the steel pipe at circumferential pitches, an arc-shaped soil plate is formed between the longitudinal slits, and a connector is connected to each arc-shaped soil plate. Anchor rod used for slope stabilization method characterized by having a section.