JPH0678641B2 - Slope stabilization method - Google Patents

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a slope stabilization method for slopes such as slopes facing highways and various facilities constructed by the open cut method or steep slopes that may collapse.

[0002]

2. Description of the Related Art Many construction methods are used to protect slopes such as slopes.

For example, a conventional technique called a lap frame method uses a form A as shown in FIG.

The above mold A is composed of a pair of left and right side plates 1, 1
And a plurality of connecting frames 2 connecting the both side plates 1, 1. The material of the left and right side plates 1 is a plastic plate, a cardboard, a metal lath, a crimp wire mesh, or the like. The connecting frame 2 includes a plurality of vertical bars 4 made of the same material, which are arranged at appropriate intervals, between upper and lower horizontal bars 3 made of a thin steel bar or the like, and the intersection of the horizontal bar 3 and the vertical bar 4 is welded. Both ends of the upper and lower horizontal bars 3 are rotatably connected to the side plate 1 by means of means.

The form A carried to the site is composed of left and right side plates 1, 1
Open and install at the desired place, but before that, place the reinforcing bar at the desired place on site. That is, a plurality of upward U-shaped lower transverse bars 5 called lower stirrup are arranged at appropriate intervals at the site where the formwork is to be installed, and a plurality of lower main reinforcing bars 6 are arranged in parallel on the lower transverse bars 5. Line up.

Then, the intersection of the lower horizontal reinforcing bar 5 and the lower main reinforcing bar 6 is bound by a binding wire 7 such as a thin wire, and a metal wire 8 is stretched obliquely between the lower horizontal reinforcing bar 5 and the lower main reinforcing bars 6 at both ends. The lower lateral muscle 5 is held vertically so that it does not fall.

From the upper side of the reinforcing bar installed as described above, the left and right side plates 1 are located outside the lower horizontal bar 5, and the form A is installed while being careful not to bend the lower horizontal bar 5.

Next, a plurality of upper main reinforcing bars 9 are arranged in parallel on the horizontal bar 3 on the upper part of the form A, and a plurality of upper lateral reinforcing bars 10, which are called downward upper C-shaped upper stirrup, are attached to the upper main reinforcing bars 9 from the upper side and the lower side. The upper lateral reinforcing bars 5, 10 and the upper main reinforcing bars 9 are bound by a binding wire. After that, mortar and concrete are placed in the form A.

[0009]

Since the concrete structure (formal frame) constructed using the above-mentioned formwork is not fixed to the ground, there is a problem that the slope cannot be stabilized by the concrete structure. It was

In particular, a gap is generated between the concrete structure and the slope due to the fluctuation of the ground, so that the tension cannot be applied to the slope. That is, it does not adhere to the ground.
Therefore, the slope cannot be stabilized.

Further, since a long formwork and a reinforcing bar are carried on the slope, there is a problem that a great deal of labor is required.

Therefore, an object of the present invention is to provide a slope stabilizing method in which a tension is applied to the slope to stabilize the slope.

[0013]

In order to solve the above-mentioned problems, the present invention is to fix the tension member inserted into the ground from the point where the tension force is required on the slope by an appropriate method, and then to pull the tension projecting on the slope. Let the material support the rebar cage by an appropriate method, then, while covering the rebar cage with a mold that presses the back open edge on the slope, temporarily fix the mold to the tension material by an appropriate method, After that, concrete was placed in the formwork, the formwork was collected after hardening of the cast concrete, and a concrete pressure receiving material was fixed to the tension member via a fastener. It is a thing.

[0014]

First, the tension member inserted into the ground from the point where the tension force is required on the slope is fixed by an appropriate method.

Next, the rebar cage is placed on the slope, the rebar cage is supported by a tension member by means of nuts and the like, and then the rebar cage is covered with a formwork which presses the rear open edge on the slope and the tension member is pulled. Temporarily fix the form to the nut. Then, concrete is placed in the formwork.

After hardening of the cast concrete, the formwork is removed, and the concrete pressure receiving material is fixed to the tension material with a fastening tool to stabilize the slope.

[0017]

Embodiments of the slope stabilizing method according to the present invention will be described below with reference to the accompanying drawings.

Reference numeral 21 shown in FIG. 1 is a rebar cage.

In the case of the above-mentioned rebar cage 21, one square welded wire mesh (where the intersecting portions of the vertical and horizontal wires are fixed by welding) is fixed to the square top wall portion 22 and this top wall portion in the illustrated case. Although it is bent (by pressing) so as to be constituted by the trapezoidal peripheral wall portion 23 that is continuous from the peripheral edge of 22, the shape and method other than the above may be used. As shown in the drawing, a pressure receiving member 24 made of a metal plate having the same shape is superposed on the surface of the top wall portion 22 of the reinforcing bar basket 21 and fixed by welding if necessary, and a through hole 25 is provided in the center of the pressure receiving member 24. If you put
It is possible to penetrate the through hole 25 with a tension member, which will be described later, so that the pressing force of the fastener screwed into the tension member can favorably act on the entire surface of the top wall portion 22.

Reference numeral 26 shown in FIG. 1 denotes a backside mold which covers the rebar cage 21.

In the illustrated case, the formwork 26 is a rebar cage 21.
Main plate 27 facing the top wall portion 22 of the vehicle at a predetermined interval.
And a peripheral side plate 28 that is continuous from each edge of the main plate 27 and faces the peripheral wall portion 23 at a predetermined interval.
A model (not shown) that can be assembled and disassembled may be adopted.
The form 26 is not limited to the trapezoid shown. Also,
The through hole 2 of the pressure receiving member 24 is provided in the center of the main plate 27 of the mold 26.
5 is provided with a through hole 29.

Next, a slope stabilizing method using the rebar cage 21 and the form 26 will be described.

First, a boring hole 31 is provided in the ground from a point where a tension force is required on the slope 30, and a tensile member 32 such as a PC steel rod is inserted into the boring hole 31. Then, cement milk or the like is put in the boring hole 31. The anchor body 34 is formed while injecting the grout material 33 (shown in FIG. 2).

Next, the reinforcing bar cage 21 is carried to the slope 30 and the tip end side of the tension member 32 exposed on the slope 30 is penetrated through the through hole 25 of the pressure receiving member 24, and then from the tip of the tension member 32 to the middle. While the nut 36 is screwed into the screw portion 35 provided on the outer periphery of the, the reinforcing bar 21 is grounded to the slope 30 by the contact between the pressure receiving member 24 and the nut 36.

If the reinforcing bar is required for the stress calculation, the required amount of the reinforcing bar 37 is arranged on the slope 30 in advance,
When the reinforcing bar cage 21 is pressed onto the reinforcing bar 37 or when the reinforcing bar cage 21 is reinforced, a plurality of reinforcing bar cages (not shown) having different diameters are stacked by stacking the pressure receiving members 24, or the reinforcing bar cage is provided with ( (Not shown) It may be inserted and arranged.

After that, the rebar cage 21 is covered with the form 26 while the tension member 32 is passed through the through hole 29. The covered mold frame 26 includes a nut 38 screwed into the screw portion 35 and the main plate 2
The rear open edge of the mold 26 is pressed against the slope 30 by abutting with 7.

Then, the concrete 39 is placed in the formwork 26.
To place. The above-mentioned concrete is placed by opening and closing a lid 40 which can be opened and closed at the highest point of the form 26 installed as shown in FIG.
Open the lid 40 by providing an opening 41 with
Then, the lid 40 is closed.

After hardening of the cast concrete, the nut 38 is removed to collect the form 26, and then the screw 35
The nut 42 screwed in is brought into contact with the surface of the concrete pressure receiving member 43 (shown in FIG. 3).

The concrete pressure receiving member 43 is shown in FIG.
As shown in FIG. 5, the cells are arranged so as to form cells, and the cells are laid in a suitable manner according to the conventional method, such as soil vegetation and cobblestone filling, and as shown in FIG.

[0030]

[Effects] As described above, according to the slope stabilizing method of the present invention, the pressure-receiving material made of concrete cast in situ is fixed to the tension member fixed in the ground through the fasteners so as to be in close contact with the slope surface. The tension can be applied to the slope to stabilize the ground.

[Brief description of drawings]

FIG. 1 is an exploded perspective view of an embodiment of the present invention.

[Fig.2] Enlarged vertical section view with a reinforcing bar cage and formwork set on the slope

FIG. 3 is a side view in which a pressure receiving material is fixed on a slope.

FIG. 4 is a front view showing the arrangement of pressure receiving members.

FIG. 5 is a front view showing another arrangement example of the pressure receiving member.

FIG. 6 is a perspective view of a conventional slope stabilizing method.

[Explanation of symbols]

 21 Reinforcing Bar Basket 22 Top Wall 23 Peripheral Wall 24 Pressure-Receiving Member 25 Through Hole 26 Form 27 Main Plate 28 Peripheral Side Plate 29 Through Hole 30 Slope 31 Boring Hole 32 Pulling Material 33 Grout Material 34 Anchor Body 35 Screw Part 36, 38, 42 Nut 37 Reinforcing bar 39 Concrete 40 Lid 41 Opening 43 Pressure receiving material

Claims (1)

[Claims] 1. A tension member inserted into the ground from a point where a tension force is required on the slope is fixed by an appropriate method, and then a reinforcing bar cage is supported by the tension member protruding on the slope by an appropriate method. While covering the rebar cage with a formwork that presses the rear open edge on the slope, temporarily fix the formwork to the tension member by an appropriate method, and then place concrete in the formwork, A slope stabilizing method characterized in that after the cast concrete is hardened, the formwork is collected, and a concrete pressure receiving material is fixed to the tension material via a fastener.