JPH0678638B2 - Construction method of slope protection structure - Google Patents

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for constructing a slope protection structure for preventing collapse of a slope, and more particularly to a method for constructing a slope protection structure which is easy to construct.

[0002]

2. Description of the Related Art The applicant of the present application filed Japanese Patent Application No. 61-142322.
The invention disclosed in Japanese Patent Laid-Open No. 63-533 is disclosed. According to the invention, the formwork is installed on the slope in a grid pattern,
Further, a formwork is installed at the grid-like intersection so as to surround it. Hardening material such as concrete is cast on the formwork to construct the grid-like method frame and intersections. The overhanging portion protects the intersection where stress concentrates and becomes a strong slope protection structure. In particular, since the crossing portion is fixed to the anchor placed in the natural ground, the strength of this portion is required.

[0003]

A problem with such an invention is that it takes time and effort to construct the intersection. That is, it is troublesome and labor-intensive to connect the four formwork for reinforcing the intersection part to the formwork for constructing the legal form part on site. Further, when the frame forming the intersecting portion is formed by a wire mesh member, the strength is low and the intersecting portion may largely bulge in the lateral direction, so that the structure as designed may not be obtained. Further, as described above, this crossing portion is fixed to the ground anchor placed in the ground to give a prestressing force, and a large strength capable of withstanding this pulling force is required.

The present invention has been made in order to solve the above problems, and can construct a structure having a large strength, can be easily constructed, and can construct a slope protection structure as designed. The purpose is to provide a construction method.

[0005]

SUMMARY OF THE INVENTION The present invention uses a ring-shaped streak and an intersecting form having a porous dam plate stretched thereon to facilitate construction. The cross-shaped form is constructed by arranging the ring-shaped streaks in parallel in the vertical direction and stretching the porous dam plates at appropriate intervals between the ring-shaped streaks. The crossing form may be assembled in a ring shape in advance at the factory, but it may be assembled in the field with a porous dam plate stretched between two reinforcing bars to form a ring shape. A ring-shaped hoop muscle that is concentric with the ring-shaped muscle is arranged in the intersecting part form. Each gap of the porous dam plate is formed on each of the four sides of the intersecting formwork, and the normal formwork standing upright parallel to each other is inserted into this gap. The tip of the normal formwork inserted from all sides is brought close to the hoop muscle. A cement-based hardening material is placed in the cross section form and the normal form to construct the cross section and the normal form.

In another method according to the present application, ring-shaped hoop muscles are arranged in the ground. After this, the normal formwork is arranged vertically and horizontally on the natural ground, assembled on the slope in a grid pattern, and brought close to the tip hoop muscle. The ring-shaped streaks are arranged vertically so as to surround the intersection of this legal formwork. The ring-shaped streaks are arranged horizontally with respect to the ground by passing through the holes of the porous dam plate of the standard formwork. Between the upper and lower ring-shaped streaks, a porous dam plate may be stretched so as to cover the corners of the normal formwork to form the intersecting formwork. Expanded metal or crimp wire mesh can be used as the porous dam plate as described above.

[0007]

DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will be described in detail below based on an embodiment shown in the drawings. In the figure, 1 is an intersection formwork,
It is composed of ring-shaped streaks 2 and 2 arranged vertically and a porous dam plate stretched between them. In the embodiment, a crimp wire net 3 is used as the porous dam plate. The intersection form 1 may be preliminarily formed into a ring shape at the factory, or a crimp wire net 3 stretched by welding or the like may be formed between two rebars and bent into a ring shape on site. It can also be configured. The crimp wire nets 3 are stretched at appropriate intervals, and the gaps 4 between the crimp wire nets 3 are opened on all four sides of the intersecting form 1. In the figure, 13 is a ground anchor placed in the ground, which gives a prestressing force after the structure is completed to fix the intersection.

A hoop muscle 12 concentric with the ring-shaped muscle is arranged in the cross frame 1 placed on the natural ground. Hoop muscle 12
Are laid out at appropriate intervals above and below. From each gap of this intersection part formwork 1, the crimp wire nets 5
Insert the legal formwork 6 upright. Before inserting the legal form 6, a lower end reinforcing bar 7 to be reinforced between the legal forms 6 is arranged in advance along the ground. The legal form 6 is brought to a position in the intersection form 1 close to the hoop muscle 12. Therefore, the legal form 6 extends in all directions from the hoop muscle 12 as the center. By stopping the tip of the legal form 6 in front of the hoop muscle 12, the legal form does not hinder the arrangement of the hoop muscle 12.

After that, the crimp wire nets 5 on the left and right of the legal form 6
The space between 5 is held by a spacer, and the upper end reinforcing bar 8 is arranged along the normal form frame 6. Concrete 9 which is a cement-based hardening material is placed in the intersecting form 1 and the method form 6, and the forming method part 10 as shown in FIG. , Crossing 11 having reinforced portion projecting around
A slope protection structure is formed in which the ridge is formed.

FIG. 5 and FIG. 6 show another construction method. First, a plurality of hoop muscles 12 are arranged in the ground. The normal form frame 6 is assembled in a vertical and horizontal lattice pattern so as to extend in all directions around the hoop streak 12. The ring-shaped streaks 2 are arranged vertically so as to surround the intersection of the vertical and horizontal formwork. The ring-shaped streaks 2 are to be maintained horizontally through the holes of the dam plate of the legal form 6, that is, the mesh of the crimp wire net 5 in the embodiment, and the ring-shaped streaks 2 and 2 are supported by the crimp wire net 5. Will be. A crimp wire mesh 3 is stretched between the upper and lower ring-shaped streaks 2 and 2 so as to cover the corners of the normal formwork 6 and 6. The crimp wire netting 3 is made slightly higher than the space between the ring-shaped streaks 2 and 2, and is stretched from the inside of the ring-shaped streaks 2 and fixed by welding or binding wires.

FIG. 7 and FIG. 8 show another embodiment,
The ring-shaped muscle 2 and the hoop muscle 12 of the intersection part form 1 are bent into an octagon so that the projecting portion of the intersection part 11 to the periphery is a triangle. In addition, the ring-shaped streak 3 may be another polygon such as a quadrangle.

[0012] As described above, the porous dam plate of the legal form 6 is deeply inserted until it comes close to the hoop muscle 2 in the intersecting form 1. This means that the covering material of the hardening material on the dam plate at that portion becomes large, and the dam plate of the legal form 6 has an intersection 11
It will fully function as a structural material inside. Therefore, the intersection where stress is concentrated is reinforced by the weir plate that has entered inside. In the end, the present invention is characterized in that the dam plate 5 of the legal form 6 is deeply inserted in front of the hoop muscle 12 and does not intersect the hoop muscle 12. This does not cause any hindrance to the arrangement of the hoop muscles 12, and the weir plate and the hoop muscles 12 that have entered the intersection 11
This will reinforce the part where stress is concentrated.

[0013]

Since the present invention has the above-mentioned structure, the following effects can be obtained. The upper and lower ring-shaped streaks are used to form the intersection formwork, which significantly reduces on-site work and simplifies construction. Since the tip of the legal form is close to the hoop muscle and does not intersect the hoop muscle, it does not hinder the arrangement of multiple hoop muscles. The area of the intersection of the vertical beam and the horizontal beam becomes wider due to the intersection part, and the pressure receiving area of the ground beneath it becomes wider, and when the prestressing force is applied to the anchor, the ground load may cause the ground to sink. There is no. Since the shape of the intersecting part form is maintained by the ring-shaped streaks, it can be constructed as designed without being deformed by the weight of the hardening material. The weir plate of the legal form enters the intersection and functions as a structural material, and is reinforced by the hoop reinforcement arranged in the intersection, and the strength of the portion where the stress is concentrated becomes extremely large. In particular, installation of the hoop muscle can prevent splitting at the intersection. By installing a large hoop, unlike the conventional effect of a spiral bar directly below the anchor bearing plate, it becomes possible to perform shear reinforcement at the intersection of the vertical beam and the horizontal beam.

[Brief description of drawings]

FIG. 1 is a perspective view of an embodiment of a construction state of a slope protection structure according to the present invention.

FIG. 2 is a perspective view showing a state in which a mold is assembled.

FIG. 3 is a plan view thereof.

FIG. 4 is an overall view of a slope protection structure.

FIG. 5 is a plan view of another construction example.

FIG. 6 is a sectional view taken along the line AA.

FIG. 7 is a perspective view of an intersection formwork.

FIG. 8 is a plan view thereof.

[Explanation of symbols]

 1 Intersection Form 2 Ring-shaped Reinforcing 3 Crimp Wire Mesh 4 Gap 5 Crimp Wire Mesh 6 Formwork 7 Bottom Reinforcing Bar 8 Top Reinforcing Bar 9 Concrete 10 Formwork 11 Intersection 12 Hoop Rein 13 Ground Anchor

Claims (4)

[Claims] 1. An intersection form frame, in which porous dam plates are stretched at appropriate intervals between upper and lower ring-shaped streaks, is installed on the ground, and the ring-shaped streaks are placed in the intersection part form. A ring-shaped hoop muscle that is concentric with is arranged, and from each gap between the porous weir plates that open on all four sides of the intersecting form, insert the legal form that stands up the porous weir plates in parallel to the left and right. Construction method of a slope protection structure in which the tip is brought close to the hoop muscle and a cement-based hardening material is placed in the intersection form and the normal form to construct the intersection and the slope form. 2. Arranging a ring-shaped hoop muscle on the ground,
The legal formwork in which the porous weir plates are erected in parallel to the left and right are arranged vertically and horizontally on the slope and the tip is brought close to the hoop muscle, and the ring-shaped muscle is formed so as to surround the intersection of the legal formwork. Through the holes of the porous weir plate, and arrange the bars in parallel vertically, and extend the porous weir plate to cover the corners of the legal formwork to form a crossing formwork. And a construction method of slope protection structure in which cement-based hardening material is placed in the legal form to construct the intersection and the legal frame. 3. The method for constructing a slope protection structure according to claim 1, wherein expanded metal is used as the porous dam plate. 4. The method for constructing a slope protection structure according to claim 1, wherein a crimp wire net is adopted as the porous dam plate.