JPH0216217A - Prestress introduction in slope-stabilizing structure - Google Patents

Abstract

PURPOSE:To introduce prestress into a structure with high efficiency without causing damage to the structure by a method in which when fixing a structure to anchors driven into the ground, PC steels set crossly with the anchor near the bottom of the structure and the anchors are alternately tensed. CONSTITUTION:Anchors 6 are driven into the ground, and the ends projected from the ground's surface of the anchors 6 are passed through the anchor hole 4 in the central part 2 of a slope-stabilizing structure 1 and fixed to a distribution plate 14 on the central part 2 by wedge 15, etc. A prestress is introduced alternately into PC steels 8 set near the bottom in the straight extended portions 3 and the anchors 6 for final tension. Since no extremely different imbalance forces act on the structure, the breakage of the structure by one-side force can be prevented.

Description

[Detailed Description of the Invention] [Industrial Application Field] This invention is a pre-slope stabilizing structure that fixes a structure to an anchor and introduces a prestress force, and presses down the ground by the prestress applied to the structure. This relates to a method of introducing stress force.

[Prior art]

Conventionally, a method has been widely adopted in which a concrete slope stabilizing structure is fixed to an anchor driven into the ground, and a press 1-res force is applied to the anchor. Press 1 to Reska press down the ground to stabilize the ground.

[Problems to be solved by this invention]

In such a slope stabilizing structure, when a large prestress force is introduced to the anchor, a tensile force acts on the bottom of the structure. This tensile force can cause damage to the structure.

In order to counteract this tensile force, a PC steel material is placed at the bottom of the structure in a direction perpendicular to the anchor, and this P
It is possible to introduce prestress force to C steel material, but before the anchor press 1~reska acts, PCwJ
When a prestress force is applied to a material, tensile stress is applied to the upper part of the structure, which may cause damage.

Therefore, when a prestressing steel material is disposed within a structure, it is disposed slightly below the middle part of the structure to prevent biased forces from acting on the top or bottom. However, in order to provide the required prestressing force to the bottom with this PC steel material, a considerably large tensile force must be applied, which is an uneconomical design.

This invention was made to solve the above-mentioned problems, and its purpose is to provide a method for introducing prestress force into a slope stabilizing structure that can be constructed efficiently without damaging the structure. .

[Means to solve the problem]

The method of introducing prestress force into a slope stabilizing structure according to the present invention includes arranging a prestressing force near the bottom of the structure in a direction perpendicular to the anchor, and introducing a prestress force to the anchor. The final tension is achieved by alternately repeating the introduction of prestress force.

〔Example〕

Hereinafter, the present invention will be described in detail based on an embodiment shown in the drawings.

In the figure, reference numeral 1 denotes a slope stabilizing structure made of concrete, which is formed into a cross shape by a center part 2 having an anchor hole 4 penetrating vertically, and an overhang part 3 extending from the center part 2 in all directions. .

The height of each projecting portion 3 gradually decreases toward the tip.

In the embodiment, a recess 2a is provided on the lower surface of the center portion 2 and the overhang portion 3;
3a is recessed, and an inflow hole 9 is formed on the upper surface to pass into the recesses 2a, 3a.

Near the bottom of the linearly located overhangs 3, 3, there is a P
C steel materials 8, 8 are arranged. The PC steel material 8 is arranged in a direction perpendicular to the anchor hole 4. As the PC steel material 8, a PC steel bar, a PC steel wire, a PC steel stranded wire, etc. can be used.

A slope stabilizing structure like the one above is installed on the ground! ! place

First, an anchor 6 is driven into the ground. As the anchor 6, a rock anchor, a rock bolt, etc. can also be used. In the embodiment, a ground anchor is used as the anchor 6. In other words, multiple PCs passed through the sheath 10
A steel wire 11 is inserted into a drilled hole 12 and fixed with grout material 13.

The end of the anchor 6 that protrudes above the ground is passed through the anchor hole 4 of the center part 2 and fixed to the bearing plate 14 on the center part 2 by a screw 15 or the like.

Approximately 5% of the design prestress force is applied to the anchor 6, and then up to 50% of the design force is applied to the PC steel material 8 of the structure 1. After that, 50% of the designed force is applied to the anchor 6 as well.

Next, apply the remaining 50% of the force to the PC steel material 8, and
Apply the remaining 50% of the force to the final 100% prestress force.

In this way, instead of applying prestress force at different times, if the anchors 6 are applied alternately to the PC steel material 8, the structure 1
It never fails.

Thereafter, mortar or concrete 16 may be poured into the recesses 2a, 3a of the structure through the inflow hole 9.

This invention provides a structure 1 fixed to a slope by an anchor 6.
If so, various shapes can be adopted, not limited to the above-mentioned shapes.

〔Effect of the invention〕

■ By applying prestress force alternately to the anchor and the PC steel material placed at the bottom of the structure, the balance of forces acting on the structure will not be extremely different, and the structure will not be damaged by one force. can be avoided.

@ Even if the PC steel material is placed at the bottom of the structure, it is possible to avoid large tensile forces from acting on the top, and by providing a rationally designed prestress force, it is extremely effective compared to conventional construction. economical structures can be built.

[BRIEF DESCRIPTION OF THE DRAWINGS] FIG. 1 is a sectional view of the slope stabilizing structure, FIG. 2 is a perspective view thereof, and FIG. 3 is a perspective view of the slope stabilizing structure arranged on the ground. ■...Slope stabilization structure, 2...Center, 3...Overhang, 4...Anchor hole, 6... Anchor 8...PC steel material. Diagram

Claims (1)

[Claims] (1) When a structure is fixed to an anchor cast into the ground and a prestress force is introduced, and the prestress force applied to the structure is used to press down the ground, a structure is placed near the bottom of the structure and perpendicular to the anchor. Prestressing of a slope stabilizing structure characterized by arranging prestressing steel materials in the direction of Force introduction method.